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C/C++ Source or Header  |  1994-11-29  |  151 b   |  9 lines
  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. #include <math.h>
  3.  
  4. double
  5. atanh(double x)
  6. {
  7.   return log((1+x)/(1-x)) / 2.0;
  8. }
  9.