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Name atan - arc tangent function Synopsis #include <math.h> double atan(double x); Description The atan() function calculates the arc tangent of x; that is the value whose tangent is x. Return Value The atan() function returns the arc tangent in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive). Conforming to SVID 3, POSIX, BSD 4.3, ISO 9899 See Also acos(3) , asin(3) , atan2(3) , cos(3) , sin(3) , tan(3)

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