NAME

casin, casinf, casinl — complex circular arc sine

SYNOPSIS

Math Library (libm, -lm)
#include <complex.h>

double complex
casin(double complex z);

float complex
casinf(float complex z);

long double complex
casinl(long double complex z);

DESCRIPTION

The casin(), casinf() and casinl() functions compute the complex circular arc sine of z.

For all complex floating-point numbers z,

casin(z) = -i clog(iz + csqrt(1 - z^2)).

RETURN VALUES

The casin(), casinf() and casinl() functions return the complex circular arc sine of z with unbounded imaginary part, and real part in the interval [-Pi/2, Pi/2].

SEE ALSO

cacos(3), catan(3)

STANDARDS

The casin(), casinf() and casinl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).