This is part of the HicEst documentation
COS(x): Cosine of x
In a right triangle the cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.
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cosine_of_X = COS( X )
! X must be in radians and is treated as modulo 2*pi
a = COS( 3.1415 ) ! a is assigned -1
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