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cosh.c
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00001 /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ 00002 #include <math.h> 00003 00004 #ifdef _MSC_VER 00005 #pragma function(cosh) 00006 #endif 00007 00008 /* 00009 * @implemented 00010 */ 00011 double cosh(double x) 00012 { 00013 const double ebig = exp(fabs(x)); 00014 return (ebig + 1.0/ebig) / 2.0; 00015 }
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