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.
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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.
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