cacos, cacosf, cacosl — complex arc cosine
#include <complex.h>
double complex cacos( |
double complex | z); |
float
complex cacosf( |
float complex | z); |
long
double complex cacosl( |
long double complex | z); |
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The cacos() function
calculates the complex acos(). If y = cacos(z), then z =
ccos(y). The real part of y is chosen in the interval
[0,pi].
One has cacos(z) = −i clog(z + csqrt(z * z − 1)).