casin man page

casin, casinf, casinl — complex arc sine


#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.


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))


These functions first appeared in glibc in version 2.1.


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

casin(), casinf(), casinl()Thread safetyMT-Safe

Conforming to

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

See Also

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

Referenced By

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

Explore man page connections for casin(3).

casinf(3) and casinl(3) are aliases of casin(3).