atanh.3 revision 302408
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from: @(#)atanh.3 5.2 (Berkeley) 5/6/91
$FreeBSD: stable/11/lib/msun/man/atanh.3 251599 2013-06-10 06:04:58Z das $
.Dd June 9, 2013 .Dt ATANH 3 .Os .Sh NAME .Nm atanh , .Nm atanhf , .Nm atanhl .Nd inverse hyperbolic tangent functions .Sh LIBRARY .Lb libm .Sh SYNOPSIS n math.h .Ft double .Fn atanh "double x" .Ft float .Fn atanhf "float x" .Ft long double .Fn atanhl "long double x" .Sh DESCRIPTION The .Fn atanh , .Fn atanhf , and .Fn atanhl functions compute the inverse hyperbolic tangent of the real argument .Ar x . For a discussion of error due to roundoff, see .Xr math 3 . .Sh RETURN VALUES These functions return the inverse hyperbolic tangent of .Ar x if successful. If the argument has absolute value 1, a divide-by-zero exception is raised and an infinity is returned. If .Ar |x| > 1, an invalid exception is raised and an \*(Na is returned. .Sh SEE ALSO .Xr acosh 3 , .Xr asinh 3 , .Xr exp 3 , .Xr fenv 3 , .Xr math 3 .Sh HISTORY The .Fn atanh , .Fn atanhf , and .Fn atanhl functions appeared in x 4.3 , .Fx 2.0 , and .Fx 10.0 , respectively.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
from: @(#)atanh.3 5.2 (Berkeley) 5/6/91
$FreeBSD: stable/11/lib/msun/man/atanh.3 251599 2013-06-10 06:04:58Z das $
.Dd June 9, 2013 .Dt ATANH 3 .Os .Sh NAME .Nm atanh , .Nm atanhf , .Nm atanhl .Nd inverse hyperbolic tangent functions .Sh LIBRARY .Lb libm .Sh SYNOPSIS n math.h .Ft double .Fn atanh "double x" .Ft float .Fn atanhf "float x" .Ft long double .Fn atanhl "long double x" .Sh DESCRIPTION The .Fn atanh , .Fn atanhf , and .Fn atanhl functions compute the inverse hyperbolic tangent of the real argument .Ar x . For a discussion of error due to roundoff, see .Xr math 3 . .Sh RETURN VALUES These functions return the inverse hyperbolic tangent of .Ar x if successful. If the argument has absolute value 1, a divide-by-zero exception is raised and an infinity is returned. If .Ar |x| > 1, an invalid exception is raised and an \*(Na is returned. .Sh SEE ALSO .Xr acosh 3 , .Xr asinh 3 , .Xr exp 3 , .Xr fenv 3 , .Xr math 3 .Sh HISTORY The .Fn atanh , .Fn atanhf , and .Fn atanhl functions appeared in x 4.3 , .Fx 2.0 , and .Fx 10.0 , respectively.