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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