src/complex/catanh.c


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#include "complex_impl.h"

/* atanh = -i atan(i z) */

double complex catanh(double complex z)
{
	z = catan(CMPLX(-cimag(z), creal(z)));
	return CMPLX(cimag(z), -creal(z));
}


#ifdef TEST
int
main(void) {
	return 0;
}
#endif