| 1 | .\" Copyright (c) 1991 The Regents of the University of California. |
| 2 | .\" All rights reserved. |
| 3 | .\" |
| 4 | .\" Redistribution and use in source and binary forms, with or without |
| 5 | .\" modification, are permitted provided that the following conditions |
| 6 | .\" are met: |
| 7 | .\" 1. Redistributions of source code must retain the above copyright |
| 8 | .\" notice, this list of conditions and the following disclaimer. |
| 9 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| 10 | .\" notice, this list of conditions and the following disclaimer in the |
| 11 | .\" documentation and/or other materials provided with the distribution. |
| 12 | .\" 3. Neither the name of the University nor the names of its contributors |
| 13 | .\" may be used to endorse or promote products derived from this software |
| 14 | .\" without specific prior written permission. |
| 15 | .\" |
| 16 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 17 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 20 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 21 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 23 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 25 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | .\" SUCH DAMAGE. |
| 27 | .\" |
| 28 | .\" from: @(#)tanh.3 5.1 (Berkeley) 5/2/91 |
| 29 | .\" $FreeBSD: head/lib/msun/man/tanh.3 226458 2011-10-17 05:41:03Z das $ |
| 30 | .\" |
| 31 | .Dd August 17, 2013 |
| 32 | .Dt TANH 3 |
| 33 | .Os |
| 34 | .Sh NAME |
| 35 | .Nm tanh , |
| 36 | .Nm tanhf , |
| 37 | .Nm tanhl |
| 38 | .Nd hyperbolic tangent functions |
| 39 | .Sh LIBRARY |
| 40 | .Lb libm |
| 41 | .Sh SYNOPSIS |
| 42 | .In math.h |
| 43 | .Ft double |
| 44 | .Fn tanh "double x" |
| 45 | .Ft float |
| 46 | .Fn tanhf "float x" |
| 47 | .Ft long double |
| 48 | .Fn tanhl "long double x" |
| 49 | .Sh DESCRIPTION |
| 50 | The |
| 51 | .Fn tanh , |
| 52 | .Fn tanhf , |
| 53 | and |
| 54 | .Fn tanhl |
| 55 | functions compute the hyperbolic tangent of |
| 56 | .Fa x . |
| 57 | For a discussion of error due to roundoff, see |
| 58 | .Xr math 3 . |
| 59 | .Sh RETURN VALUES |
| 60 | The |
| 61 | .Fn tanh , |
| 62 | .Fn tanhf , |
| 63 | and the |
| 64 | .Fn tanhl |
| 65 | functions return the hyperbolic tangent value. |
| 66 | .Sh SEE ALSO |
| 67 | .Xr acos 3 , |
| 68 | .Xr asin 3 , |
| 69 | .Xr atan 3 , |
| 70 | .Xr atan2 3 , |
| 71 | .Xr cos 3 , |
| 72 | .Xr cosh 3 , |
| 73 | .Xr ctanh 3 , |
| 74 | .Xr math 3 , |
| 75 | .Xr sin 3 , |
| 76 | .Xr sinh 3 , |
| 77 | .Xr tan 3 |
| 78 | .Sh STANDARDS |
| 79 | The |
| 80 | .Fn tanh |
| 81 | function conforms to |
| 82 | .St -isoC . |