1 #include "complex_impl.h" 2 3 /* acosh(z) = ±i acos(z) */ 4 cacosh(double complex z)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 } 13