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ATAN (3) | C library functions | Unix Manual Pages | :man

NAME

atan, atanf - arc tangent functions of one variable

CONTENTS

Library
Synopsis
Description
Return Values
See Also
Standards

LIBRARY


.Lb libm

SYNOPSIS


.In math.h double atan "double x" float atanf "float x"

DESCRIPTION

The atan and the atanf functions compute the principal value of the arc tangent of x. For a discussion of error due to roundoff, see math(3).

RETURN VALUES

The atan and the atanf function returns the arc tangent in the range
.Bk -words [-pi/2, +pi/2]
.Ek radians.

SEE ALSO

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

STANDARDS


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