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46 lines
1.7 KiB
46 lines
1.7 KiB
/************************************************************************ |
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* libc/math/lib_tan.c |
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* |
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* This file is a part of NuttX: |
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* |
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* Copyright (C) 2012 Gregory Nutt. All rights reserved. |
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* Ported by: Darcy Gong |
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* |
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* It derives from the Rhombs OS math library by Nick Johnson which has |
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* a compatibile, MIT-style license: |
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* |
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* Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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* |
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************************************************************************/ |
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/************************************************************************ |
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* Included Files |
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************************************************************************/ |
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#include <nuttx/config.h> |
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#include <nuttx/compiler.h> |
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#include <math.h> |
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/************************************************************************ |
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* Public Functions |
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************************************************************************/ |
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#ifdef CONFIG_HAVE_DOUBLE |
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double tan(double x) |
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{ |
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return (sin(x) / cos(x)); |
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} |
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#endif
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