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

COLOPHON
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