Man Pages

CASIN


NAME
SYNOPSIS
DESCRIPTION
VERSIONS
ATTRIBUTES
CONFORMING TO
SEE ALSO
COLOPHON

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).

CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.

SEE ALSO

clog(3), csin(3), complex(7)

COLOPHON

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