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Make math and science easier (and more fun) with free graphing calculator programs and games from calculatorti.com. You can make the process of transfering the application to your calculator sweet and simple with Texas Instrument's handy TI connect software. Install it on your computer and grab your GraphLink Connection cable (USB cable) to plug in your calculator. Then you can start downloading any of our programs and games (Wow! There's a lot!) from our libraries to transfer and install them to your calculator. Have fun!Title:  Brief Desc.  Brief Description:  Req.  Requirements:  Category: 

Derivatives of Trig Functions  TI84 Plus and TI83 Plus graphing calculator program lists the common derivatives of trig functions. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Event Probability  TI89 graphing calculator program for calculating even probability. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Statistics ] 

Recursive Functions  TI84 Plus and TI83 Plus graphing calculator program for evaluating recursive functions. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Continuity and Differentiability of a Function  TI89 graphing calculator program for determining the continuity and differentiability of a Function. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Trigonometry and Log Functions: Domain, Range, Derivatives, and Integrals  TI84 Plus and TI83 Plus graphing calculator program displays the domain, range, derivatives and integrals for trigonometry, logarithmic and exponential functions. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Calculus Programs Collection  TI84 Plus and TI83 Plus graphing calculator program collection. Contains several features and formulas for calculus algebra, geometry and trigonometry. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Storing Data Sets  TI89 graphing calculator program for storing statistical data sets. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Statistics ] 

Graphing Slope Fields: RungeKutta Method  TI84 Plus and TI83 Plus graphing calculator program for graphing slope fields. Uses the RungeKutta method to obtain a solution for given initial condition. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Simplify Numbers with Fraction Exponents  TI84 Plus and TI83 Plus graphing calculator program for simplifying numbers with fraction exponents. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Systems of Differential Equations  TI89 graphing calculator program, solves systems of differential equations. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Differential and Integral Calculus Notes  TI84 Plus and TI83 Plus graphing calculator program. Contains notes on differential, integral calculus. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Logarithms: Change Base  TI84 Plus and TI83 Plus graphing calculator program for changing the base of logarithms. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Simpson Approximation: Area Under a Curve  TI84 Plus and TI83 Plus graphing calculator program. Uses Simpson method approximations to approximate the area under a curve. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Integrals: Area Under a Curve, Area Between 2 Curves  TI84 Plus and TI83 Plus graphing calculator program for calculating the area under a curve and the area between 2 curves. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

HalfLife Decay Formula  TI89 graphing calculator half life decay formula program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

Simplify Trig Answers  TI89 graphing calculator program for simplifying trigonometry answers. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Trigonometry ] 

Bisection Method Function Solver  TI89 graphing calculator program for solving functions with the bisection method. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

Best Calculus Program  TI84 Plus and TI83 Plus graphing calculator program. Solves a variety of calculus problems. A very good program. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Absolute Value 89  TI89 graphing calculator absolute value program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

Equation Library  TI89 graphing calculator equation library program for storing and solving equations. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

Pre Calculus and Trigonometry Functions  TI84 Plus and TI83 Plus graphing calculator program. Includes many useful pre calculus and trigonometry features. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Laplace Transform of a Derivative  TI89 graphing calculator program, calculates the Laplace transform of a derivative. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Conic Section and Angle of Rotation  TI89 graphing calculator program for calculating the type of conic section and area of rotation of an equation. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Complex Roots of Complex Numbers  TI84 Plus and TI83 Plus graphing calculator program for calculating complex roots of complex numbers. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Analytic Geometry: Points and Lines  TI89 graphing calculator program for solving analytic geometry problems involving points and lines. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Newton's Method of Approximation  TI84 Plus and TI83 Plus graphing calculator program for finding the zeros of a function using Newton's method of approximation. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Special Right Triangles  TI89 graphing calculator program contains notes and guides to special right triangles. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Multiply Factors or Polynomials  TI84 Plus and TI83 Plus graphing calculator program for multiplying factors or polynomials. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Newton's Method With Error Checking  TI84 Plus and TI83 Plus graphing calculator program for calculating the zeros of a function using Newton's method. Includes error checking. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Simpson's Rule: Area Under a Curve  TI84 Plus and TI83 Plus graphing calculator program for approximating the area under a curve using Simpson's method. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Number of Diagonals in a Polygon  TI89 graphing calculator program for finding the number of diagonals in a polygon. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Trapezoidal Rule: Area Under a Series of Points  TI84 Plus and TI83 Plus graphing calculator program. Calculates the area under a series of points on a graph using the trapezoidal rule. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Absolute Coordinate System Graphing  TI89 graphing calculator program, adds absolute coordinate system graphing to the calculator. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Graphing ] 

Graphing Piecewise Functions  TI89 graphing calculator program for graphing piecewise functions. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Graphing ] 

Find The Roots of A Function: Newton's Method  TI84 Plus and TI83 Plus graphing calculator program for finding the roots of a function using Newton's Method. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Sorting Data: Lists, Matrices and Strings  TI89 graphing calculator program for sorting statistical data. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Statistics ] 

Parallel and Perpendicular Lines  TI89 graphing calculator program. Performs calculations on parallel and perpendicular lines. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Advanced Derivative Function  TI84 Plus and TI83 Plus graphing calculator Program. Calculates the derivative of a function. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Inflation Rate  TI89 graphing calculator program for calculating inflation rate. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ BusinessFinance ] 

Linear Equations  TI84 Plus and TI83 Plus graphing calculator program for performing calculations related to linear equations including intercepts, distance, midpoint and gradient. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Single and Double Interpolation  TI89 graphing calculator program for calculating single and double interpolation. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Statistics ] 

A+ Algebra Program  TI84 Plus and TI83 Plus graphing calculator algebra program. Includes quadratic formula, factoring, foil and more. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Interior Angles of a Polygon  TI89 graphing calculator program for calculating the interior angles of a polygon. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Logarithmic Change of Base Formula  TI84 Plus and TI83 Plus graphing calculator program for changing the base of a log. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Linearization Tables  TI84 Plus and TI83 Plus graphing calculator program provides complete linearization tables using symbolic method. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Ultimate Algebra Program  TI89 graphing calculator algebra program. Includes identity matrices, recursive number sequences, and factor pair generator. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

Arc Length and Sector Area  TI89 graphing calculator program for calculating arc length and sector area. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Solving Systems of Linear Inequalities: Combination Method  TI84 Plus and TI83 Plus graphing calculator program for solving systems of inequalities. Uses the combination method. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Common Calculus Methods and Functions  TI89 graphing calculator program for finding zeros in a function, interpolation, and integration using several different methods. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Binomial Probability  TI89 graphing calculator program for calculating binomial probability. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Statistics ] 

Direct and Inverse Transformation  TI89 graphing calculator program, calculates direct and inverse transformation. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Algebra Formulas  TI84 Plus and TI83 Plus graphing calculator Program containing several common algebra formulas. Great for tests and quizzes. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Vector Calculus  Gradient, Divergence, Curl  TI89 graphing calculator vector calculus program, calculates divergence, gradient and curl. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Integral Approximations  TI89 graphing calculator programs for integral approximation using exact approximation, Simpson's rule, trapezoid rule and Riemann sums 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Exponential Regression Conversion  TI84 Plus and TI83 Plus graphing calculator program calculates exponential regression and converts answer to y=ae^(bx) form. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Dirichlet Beta Function  TI89 graphing calculator Dirichlet Beta Function program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

Maclaurin Series  TI84 Plus and TI83 Plus graphing calculator program. Displays the 7 Maclaurin series. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

3 Dimensional Function Converter  TI89 graphing calculator program for converting 3d functions. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

College Algebra Notes  TI89 graphing calculator college algebra notes program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

GDP Growth Rate  TI89 graphing calculator program for calculating GDP growth rate. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ BusinessFinance ] 

Special Right Triangles  TI89 graphing calculator program, contains a guide to special right triangles. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Trigonometry ] 

Riemann Sum  TI84 Plus and TI83 Plus graphing calculator Riemann sum program. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

GFunction  TI89 graphing calculator Gfunction program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Newton's Method  TI84 Plus and TI83 Plus graphing calculator program uses Newton's method to approximate the zeros of a function. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Converting 3D Functions  TI89 graphing calculator program for converting 3D functions. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Graph and Axis Rotation  TI89 graphing calculator program allows rotation of graphs and axis points. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Graphing ] 

Chain Rule  TI89 graphing calculator chain rule program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Normal Line Function Program  TI89 graphing calculator program for finding the equation of a normal line to a function at a point. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

Numerical Integration and Errors  TI89 graphing calculator numerical integration program 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Volume of Circular Revolution  TI84 Plus and TI83 Plus graphing calculator program for calculating volume of circular revolution 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Area of a Centroid  TI89 graphing calculator program for calculating the area of a centroid. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Area Under Curve or Function  TI84 Plus and TI83 Plus graphing calculator program for calculating the area under a curve. Graphs and labels results. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Central Beta Function  TI89 graphing calculator central beta function program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Trapezoidal Rule: Approximate Finite Integrals  TI89 graphing calculator trapezoidal rule program for approximating finite integrals. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Tangent Line Program  TI89 graphing calculator program, calculates 3 different tangent line properties. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Trigonometry ] 

Graphing Rectangle Approximation and Riemann Sums  TI84 Plus and TI83 Plus graphing calculator program for graphing rectangle approximation and Riemann sums. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Equation of an Antiderivative  TI84 Plus and TI83 Plus graphing calculator program. Finds the equation of an antiderivative. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Slope Fields  TI84 Plus and TI83 Plus graphing calculator slope fields program. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Statistics: Area Under a Curve  TI89 graphing calculator statistics program for calculating the area under a curve. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Statistics ] 

Differential Equation Solver: 2 Points  TI84 Plus and TI83 Plus graphing calculator program. Solves differential equations given 2 points. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Geometry Notes: Theorems and Postulates  TI89 graphing calculator program contains geometry notes on important theorems and postulates in geometry. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Calculus Common Functions  TI89 graphing calculator program includes several common calculus functions such as calculus volumes, densities and revolutions. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Algebra 2 Program  TI84 Plus and TI83 Plus graphing calculator Algebra 2 program with 12 different functions for algebra 2. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Algebra Help  TI84 Plus and TI83 Plus graphing calculator Algebra help program for students in intermediate algebra courses. Contains multiple useful algebra functions. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Random Numbers Program  TI89 graphing calculator program for generating random numbers. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Statistics ] 

Trapezoidal Rule: Integral Approximation  TI89 graphing calculator program for calculating integral approximations using the trapezoidal rule. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 

Euler's Method: Pi  TI89 graphing calculator program, converges to pi using Euler's Method. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Algebra II Program  TI84 Plus and TI83 Plus graphing calculator Algebra 2 program. Can solve systems of equations, solve quadratics, factor trinomials and more. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Mean Value  TI84 Plus and TI83 Plus graphing calculator mean value program. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Calculus: Slope Fields, Average Value, Riemann Sums, Line Analysis  TI84 Plus and TI83 Plus graphing calculator program for common calculus problems including slope fields, average value, Riemann sums and slope, distance and midpoint of ... 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Integration Sums: Area Under a Curve  TI84 Plus and TI83 Plus graphing calculator program. Calculates integration sums used for approximating area under a curve. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Arithmetic Geometric Mean (AGM)  TI89 graphing calculator program for calculating Arithmetic Geometric Mean (AGM). 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Statistics ] 

Annuities, Life Insurance and Pension Calculator  TI89 graphing calculator annuities, life insurance, and pensions calculator program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ BusinessFinance ] 

Euler's Theorem  TI84 Plus and TI83 Plus graphing calculator program solves for variables in Euler's theorem. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Calculus ] 

Partial Fractions and All Roots  TI89 graphing calculator partial fraction expansion program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Algebra ] 

Time, Value, Money Equations  TI89 graphing calculator program for solving the time, value, money equations. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ BusinessFinance ] 

Quadratic Equation: Completing the Square  TI84 Plus and TI83 Plus graphing calculator program for solving the quadratic equation by completing the square. Gives fast simple answers. 
Requires the ti83 plus or a ti84 model.
(Click here for an explanation)

[ Programs ] [ ti83/ti84 ] [ Algebra ] 

Amortization/Loan Payment Schedule  TI89 graphing calculator program for calculating loan payments and amortization. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ BusinessFinance ] 

Error Function  TI89 graphing calculator error function program. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Calculus ] 

Graphing 3D Space Curves  TI89 graphing calculator program for graphing 3D space curves. 
Requires the ti89 calculator.
(Click here for an explanation)

[ Programs ] [ ti89 ] [ Geometry ] 