Computes the complex arc cosine.
#include <complex.h> double complex cacos (z) double complex z; float complex cacosf (z) float complex z; long double complex cacosl (z) long double complex z;
The cacos, cacosf, or cacosl subroutine computes the complex arc cosine of z, with branch cuts outside the interval [-1, +1] along the real axis.
| z | Specifies the value to be computed. |
The cacos, cacosf, or cacosl subroutine returns the complex arc cosine value, in the range of a strip mathematically unbounded along the imaginary axis and in the interval [0, pi] along the real axis.