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C/C++ Source or Header  |  1997-12-30  |  122 b   |  10 lines
  1. #include <math.h>
  2.  
  3. double tanh(double x)
  4. {
  5.   double ex = exp(x);
  6.   double emx = exp(-x);
  7.  
  8.   return ((ex-emx)/(ex+emx));
  9. }
  10.