casin(3) — Linux manual pages

Linux manual pages	Section 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);

	Note
	Link with `−lm`.

DESCRIPTION

The casin() function calculates 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.

CONFORMING TO

C99.

COLOPHON

This page is part of release 3.33 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man-pages/.