SuSE 11.3 - man page for cacoshf (suse section 3)
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CACOSH(3) Linux Programmer's Manual CACOSH(3)
cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine
double complex cacosh(double complex z);
float complex cacoshf(float complex z);
long double complex cacoshl(long double complex z);
Link with -lm.
The cacosh() function calculates the complex arc hyperpolic cosine of z. 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 nonnegative.
cacosh(z) = (0.5) * clog((1 + z) / (1 - z))
These functions first appeared in glibc in version 2.1.
acosh(3), cabs(3), cimag(3), complex(7)
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