TI inspire CX ii 1+2sin(7pi/6) show equal to -2E-13 not 0 why?

 

This gives 0 answer on an TI-83 series but not on an nspire.
in Using TI-83 by

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

1 Answer

I don't own a TI inspire CX II, but I'm going to guess the difference lies in "rounding error".  On my TI-84 Plus, when I enter "sin(7PI/6)" it returns "-.5".  If it returns anything else, you probably are seeing a "rounding error" somewhere in the sin() function.  For all practical purposes, any computer that gives a floating point answer with an exponent of less than -7 can be considered to be zero.
by
Welcome to the calculatorti.com Texas Instruments Graphing Calculator questions and answers page and calculator help forum, Help build our members by asking and answering questions on TI-83, TI-83 Plus, TI-84 Plus, TI-89, TI-89 Titanium or any other Texas Instruments graphing calculator model.
719 questions
241 answers
3 comments
29,827 users