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Anonymous
pi is equal to 3.141592653589793238462643383279502884197169399375105...., pi is actually a endless mathematical ratio.
pi is sometimes approximated by 22 over 7.
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Cos2 doesn't equal pi; Cos2 equals roughly -0.416 (with radians).
Yes
sin(pi) = 0 so 4*sin(pi) = 0 so Y = 0
it is pi rounded
It equals 3.14.