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/* Return arc hyperbole cosine for long double value.
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Copyright (C) 1997, 1998, 2006, 2011 Free Software Foundation, Inc.
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Copyright (C) 1997, 1998, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.