This is part of the HicEst documentation
ACOS(x): Arccosine of x
ACOS(x) is the inverse trigonometric function of COS(x).
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arccosine_of_X = ACOS( X )
! X must be in radians. The result lies in the range 0 to pi
to convert degrees to radians, multiply degrees by pi/180
pi = ACOS(-1) ! calculate pi
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