casin(3)                                              Library Functions Manual                                             casin(3)

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).

       ┌─────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                                        │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │casin(), casinf(), casinl()                                                                      │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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

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

Linux man-pages 6.03                                         2022-12-15                                                    casin(3)