CASIN(3) Linux Programmer's Manual CASIN(3)
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
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))
VERSIONS
These functions first appeared in glibc in version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
┌─────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├─────────────────────────────┼───────────────┼─────────┤
│casin(), casinf(), casinl() │ Thread safety │ MT-Safe │
└─────────────────────────────┴───────────────┴─────────┘
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
SEE ALSO
clog(3), csin(3), complex(7)
COLOPHON
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latest version of this page, can be found at
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2015-04-19 CASIN(3)
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