double complex casin(double complex z);
float complex casinf(float complex z);
long double complex casinl(long double complex z);
Link with -lm.
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
casin(z) = -i clog(iz + csqrt(1 - z * z))
These functions first appeared in glibc in version 2.1.
ccos(3), clog(3), complex(7)
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