Available in all subroutines.
Computes the cosine of its argument
x, measured in radians.
x - Floating point value representing an angle in radians.
Upon successful completion, this function returns the cosine of
math.NAN, a NaN will be returned.
x is ±0, the value 1.0 will be returned.
declare local var.fo FLOAT;set var.fo = math.cos(math.PI_2);
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