/* replacement for asinh, acosh, and atanh */
#include <math.h>
double atanh(double r1)
{
double r2=r1 < 0 ? -r1 : r1;
double r3=log((r2/(1.0-r2)*2)+1)/2;
return r1 < 0 ? -r3 : r3;
// fdup f0< >r fabs 1. d>f fover f- f/ f2* flnp1 f2/
// r> IF fnegate THEN ;
}
double asinh(double r1)
{
return atanh(r1/sqrt(1.0+r1*r1));
// fdup fdup f* 1. d>f f+ fsqrt f/ fatanh ;
}
double acosh(double r1)
{
return(log(r1+sqrt(r1*r1-1.0)));
// fdup fdup f* 1. d>f f- fsqrt f+ fln ;
}
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