SYNOPSIS
#include <complex.h> "double complex cacos(double complex "z);
"float complex cacosf(float complex "z);
"long double complex cacosl(long double complex "z);
DESCRIPTION
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)).
"CONFORMING TO"
C99
"SEE ALSO"
clog(3), ccos(3)
