1 #include "complex_impl.h"
2 
3 /* atanh = -i atan(i z) */
4 
catanh(double complex z)5 double complex catanh(double complex z)
6 {
7 	z = catan(CMPLX(-cimag(z), creal(z)));
8 	return CMPLX(cimag(z), -creal(z));
9 }
10