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**Subject**: **Re: Fun math puzzle: cin(X)**
**From**: Albert Chan <albertmcchan@...>
**Date**: Thu, 4 Apr 2019 18:43:56 -0400

> On Apr 4, 2019, at 5:25 PM, Egor Skriptunoff <egor.skriptunoff@gmail.com> wrote:
>
> This implementation works only if x is in the range from (-0.7) to (+0.7)
> That's because of floating point arithmetic is approximate.
> Exact arithmetic of fractions (with arbitrary long numerator and denominator) must be used instead.
>
Building Taylor coefficents on the fly ! Amazing !
How do you figure the valid range of -0.7 to 0.7
However, this only solve 1/2 of the puzzle, unable to do cin(2.019)
Here is a hint for the second half of the puzzle:
sin(cin(X)) = cin(sin(X))