Re: How does the calculator calculate cos(x)?
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Re: How does the calculator calculate cos(x)?
Perhaps a better question you might ask is: "How will I calculate cos(x)?"
Think about how the circular functions are defined and build a theory of of
you own from there. The Taylor series
"cos(x)=1-(x^2)/2!+(x^4)/4!-(x^6)/6!+..,"(radian mode)
is good for 'small' values of x. For 'larger' values reduction formulas
are used. Just exactly which ones and how large a Taylor approximation
is used is by TI may be hard to find out. However you could develope
your own formulas and program them on your TI and compare them with the
build in TI routines.
Good Luck
Gary Wardall
>>I would like to learn how the TI's actually calculate cos(x). Can anybody
>help
>> me!!!
>
>At a guess, I'd say by using something along the lines of the
>Taylor/MacLaurin series expansion i.e.:
>
>cos(x)=1-(x^2)/2!+(x^4)/4!-(x^6)/6!+....
>
>If anybody knows any better...
>Ric.