2.3 cacosh, cacoshf—complex arc hyperbolic cosine

Synopsis

#include <complex.h>
double complex cacosh(double complex z);
float complex cacoshf(float complex z);

Description
These functions compute the complex arc hyperbolic cosine of z, with a branch cut at values less than 1 along the real axis.

cacoshf is identical to cacosh, except that it performs its calculations on floats complex.

Returns
These functions return the complex arc hyperbolic cosine value, in the range of a half-strip of non-negative values along the real axis and in the interval [-i * pi, +i * pi] along the imaginary axis.

Portability
cacosh and cacoshf are ISO C99