ACOS: Arccosine of x (F)
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⇒ Example of a ACOS call in "Trigonometric_functions" (RosettaCode)
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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