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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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