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Linux and UNIX Man Pages

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Linux 2.6 - man page for casin (linux section 3)

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 attributes(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) 2015-04-19 CASIN(3)

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