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Manual Pages  — ATAN

NAME

atan, atanf, atanl – arc tangent functions of one variable

CONTENTS

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
atan(double x);

float
atanf(float x);

long double
atanl(long double x);

DESCRIPTION

The atan(), atanf(), and atanl() functions compute the principal value of the arc tangent of x.

RETURN VALUES

These functions return the arc tangent in the range [-π/2, +π/2] radians.

SEE ALSO

acos(3), asin(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3)

STANDARDS

The atan(), atanf(), and atanl() functions conform to ISO/IEC 9899:1999 ("ISO C99").

ATAN (3) July 31, 2008

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