cacos, cacosf, cacosl - complex arc cosine
double complex cacos(double complex z);
float complex cacosf(float complex z);
long double complex cacosl(long double complex z);
Link with -lm.
The cacos() function calculates the complex arc cosine of z. If
y = cacos(z), then z = ccos(y). The real part of y is chosen in the
cacos(z) = -i clog(z + csqrt(z * z - 1))
These functions first appeared in glibc in version 2.1.
ccos(3), clog(3), complex(7)
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