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))

VERSIONS¶

These functions were added in glibc 2.1.

ATTRIBUTES¶

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

STANDARDS¶

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

SEE ALSO¶

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