casin man page

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)

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Referenced By

asin(3), complex(7), csin(3).

The man pages casinf(3) and casinl(3) are aliases of casin(3).

2015-04-19 Linux Programmer's Manual