casin, casinf, casinl − complex arc sine

#include <complex.h>

double complex casin(double complex z);

float complex casinf(float complex z);

long double complex casinl(long double complex z);

The casin() function calculates the complex asin(). 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)).

C99

clog(3), ccos(3)