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Man Pages


Manual Reference Pages  -  ATANH (3)

NAME

atanh, atanhf, atanhl - inverse hyperbolic tangent functions

CONTENTS

Library
Synopsis
Description
Return Values
See Also
History

LIBRARY


.Lb libm

SYNOPSIS


.In math.h double atanh double x float atanhf float x long double atanhl long double x

DESCRIPTION

The atanh, atanhf, and atanhl functions compute the inverse hyperbolic tangent of the real argument x. For a discussion of error due to roundoff, see math(3).

RETURN VALUES

These functions return the inverse hyperbolic tangent of x if successful. If the argument has absolute value 1, a divide-by-zero exception is raised and an infinity is returned. If |x| > 1, an invalid exception is raised and an NaN is returned.

SEE ALSO

acosh(3), asinh(3), exp(3), fenv(3), math(3)

HISTORY

The atanh, atanhf, and atanhl functions appeared in BSD 4.3 ,
.Fx 2.0 , and
.Fx 10.0 , respectively.
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