cacosh

cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine

#include <complex.h> I double complex cacosh(double complex z );
I float complex cacoshf(float complex z );
I long double complex cacoshl(long double complex z ); Link with -lm.

The R cacosh () function calculates the complex acosh(). If y = cacosh(z), then z = ccosh(y). The imaginary part of y is chosen in the interval [-pi,pi]. The real part of y is chosen non-negative.

One has: cacosh(z) = (0.5) * clog((1 + z) / (1 - z)).

C99

acosh(3), cabs(3), cimag(3), complex(7)