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Man Pages


Manual Reference Pages  - ATAN (3)

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

The atan function conforms to -isoC.
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May 2, 1991 ATAN (3)

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