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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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ATAN(x)
ATAN function calculates the arc tangent of @x; that is the value whose tangent is @x. Return value is in radians.
This function is Excel compatible.
ATAN(0.5) equals 0,463648.
ATAN(1) equals 0,785398.
TAN, COS, SIN, DEGREES, RADIANS.
