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atan, atanf
[arc tangent]

SYNOPSIS

#include <math.h> 
double atan(double x); 
float atanf(float x); 

DESCRIPTION

atan computes the inverse tangent (arc tangent) of the input value.

atanf is identical to atan, save that it operates on floats.

RETURNS

atan returns a value in radians, in the range of to .

COMPLIANCE

atan is ANSI C. atanf is an extension.