atan, atanf - arc tangent functions of one variable

CONTENTS

Library
Synopsis
Description
Return Values
See Also
Standards

.Lb libm

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

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).

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

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

The atan function conforms to -isoC.

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