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
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.
SEE ALSO
COLOPHON
- This page is part of release 3.25 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.