casin, casinf, casinl - complex arc sine
double complex casin(double complex
float complex casinf(float complex
long double complex casinl(long double complex
These functions calculate the complex arc sine of
y = casin(z), then
z = csin(y). The real part of
y is chosen in the interval [-pi/2,pi/2].
casin(z) = -i clog(iz + csqrt(1 - z * z))
These functions first appeared in glibc in version 2.1.
C99, POSIX.1-2001, POSIX.1-2008.
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