| CASIN(3) | Linux Programmer's Manual | CASIN(3) |
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.
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| 2015-04-19 |