| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 1 | .\" Copyright (c) 1991 The Regents of the University of California. |
| 2 | .\" All rights reserved. |
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| 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. All advertising materials mentioning features or use of this software |
| 13 | .\" must display the following acknowledgement: |
| 14 | .\" This product includes software developed by the University of |
| 15 | .\" California, Berkeley and its contributors. |
| 16 | .\" 4. Neither the name of the University nor the names of its contributors |
| 17 | .\" may be used to endorse or promote products derived from this software |
| 18 | .\" without specific prior written permission. |
| 19 | .\" |
| 20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 32 | .\" from: @(#)tanh.3 5.1 (Berkeley) 5/2/91 |
| 33 | .\" $FreeBSD: src/lib/msun/man/tanh.3,v 1.10 2001/10/13 12:23:23 bde Exp $ |
| 34 | .\" |
| 35 | .Dd May 2, 1991 |
| 36 | .Dt TANH 3 |
| 37 | .Os |
| 38 | .Sh NAME |
| 39 | .Nm tanh , |
| 40 | .Nm tanhf |
| 41 | .Nd hyperbolic tangent functions |
| 42 | .Sh LIBRARY |
| 43 | .Lb libm |
| 44 | .Sh SYNOPSIS |
| 45 | .In math.h |
| 46 | .Ft double |
| 47 | .Fn tanh "double x" |
| 48 | .Ft float |
| 49 | .Fn tanhf "float x" |
| 50 | .Sh DESCRIPTION |
| 51 | The |
| 52 | .Fn tanh |
| 53 | and the |
| 54 | .Fn tanhf |
| 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 | and the |
| 63 | .Fn tanhf |
| 64 | functions return the hyperbolic tangent value. |
| 65 | .Sh SEE ALSO |
| 66 | .Xr acos 3 , |
| 67 | .Xr asin 3 , |
| 68 | .Xr atan 3 , |
| 69 | .Xr atan2 3 , |
| 70 | .Xr cos 3 , |
| 71 | .Xr cosh 3 , |
| 72 | .Xr math 3 , |
| 73 | .Xr sin 3 , |
| 74 | .Xr sinh 3 , |
| 75 | .Xr tan 3 |
| 76 | .Sh STANDARDS |
| 77 | The |
| 78 | .Fn tanh |
| 79 | function conforms to |
| 80 | .St -isoC . |