casin(3) — Linux manual page

casin(3)                Library Functions Manual                casin(3)

NAME         top

       casin, casinf, casinl - complex arc sine

LIBRARY         top

       Math library (libm, -lm)

SYNOPSIS         top

       #include <complex.h>

       double complex casin(double complex z);
       float complex casinf(float complex z);
       long double complex casinl(long double complex z);

DESCRIPTION         top

       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))

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ casin(), casinf(), casinl()         │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       glibc 2.1.  C99, POSIX.1-2001.

SEE ALSO         top

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

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                       casin(3)

Pages that refer to this page: asin(3),  csin(3),  complex(7)

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