NAME
casin, casinf, casinl - complex arc sine
SYNOPSIS
#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))
VERSIONS
These functions first appeared in glibc in version 2.1.
CONFORMING TO
C99.
SEE ALSO
COLOPHON
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