casinf(3) - Linux man page
Name
casin, casinf, casinl - complex arc sineSynopsis
#include <complex.h>double complex casin(double complex z);
float complex casinf(float complex z);
long double complex casinl(long double complex z);
Link with -lm.
Description
The casin() function calculates the complex arc sine of z. If y = casin(z), then z = csin(y). The real part of y is chosen in the interval [-pi/2,pi/2].One has:
casin(z) = -i clog(iz + csqrt(1 - z * z))