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casin

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

casin, casinf, casinl - complex arc sine

LIBRARY

Math library (libm,~-lm)

SYNOPSIS

#include <complex.h>
double complex casin(double complex z);
float complex casinf(float complex z);
long double complex casinl(long double complex z);

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))

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
casin(), casinf(), casinl()	Thread safety	M-Safe

STANDARDS

C11, POSIX.-2008.

HISTORY

glibc 2.1. C99, POSIX.-2001.