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

Portability
atan is ANSI C. atanf is an extension.

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