github.com/afumu/libc@v0.0.6/musl/src/complex/cacosh.c (about)

     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  }