This is part of the HicEst documentation
ATAN(x): Arctangent of x
atan(x) is the inverse of tan(x). It is for example the solution of integral( 1/(x2 + 1) ).
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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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