src/complex/cacosh.c

   1 #include "complex_impl.h"
   2
   3 /* acosh(z) = ±i acos(z) */
   4
   5 double complex cacosh(double complex z)
   6 {
   7         int zineg = signbit(cimag(z));
   8
   9         z = cacos(z);
  10         if (zineg) return CMPLX(cimag(z), -creal(z));
  11         else       return CMPLX(-cimag(z), creal(z));
  12 }