Complex arc sine hyperbolic
double complex casinh(double complex z);
float complex casinhf(float complex z);
long double complex casinhl(long double complex z);
Link with -lm.
The casinh() function calculates the complex arc hyperbolic sine of z. If y = casinh(z), then z = csinh(y). The imaginary part of y is chosen in the interval [-pi/2,pi/2].
casinh(z) = clog(z + csqrt(z * z + 1))
These functions first appeared in glibc in version 2.1.
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