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
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))
These functions first appeared in glibc in version 2.1.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| casin (), casinf (), casinl () |
Thread safety |
MT-Safe |
C99, POSIX.1-2001, POSIX.1-2008.
clog(3),
csin(3),
complex(7)