0
Anonymous
Pi is approximately equal to 3.14159265. It is an irrational number, so it cannot be represented as a fraction and its decimal places never end or repeat, so it does not have an exact value.
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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.