ATAN: Arctangent of x (F)
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⇒ Example of a ATAN call in "Trigonometric_functions" (RosettaCode)
arctangent_of_X = ATAN( X )
! X must be in radians. The result lies in the range -pi/2 to pi/2.
to convert degrees to radians, multiply degrees by pi/180
pi =
ACOS
(-1) ! calculate pi
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