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); Link with -lm.
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.
For an explanation of the terms used in this section, see attributes(7).
|casin(), casinf(), casinl()||Thread safety||MT-Safe|
C99, POSIX.1-2001, POSIX.1-2008.
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