ccos, ccosf, ccosl − complex cosine function

#include <complex.h>

double complex ccos(double complex z);

float complex ccosf(float complex z);

long double complex ccosl(long double complex z);

The complex cosine function ccos(z) is defined as (exp(i*z)+exp(-i*z))/2.

C99

cabs(3), ctan(3), csin(3)