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C/C++ Source or Header  |  1991-03-10  |  103 b   |  8 lines
  1. #include <math.h>
  2.  
  3. double tanh(double x)
  4. {
  5.   return (exp(x) - exp(-x)) / (exp(x) + exp(-x));
  6. }
  7.  
  8.