casin(3)

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

   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 first appeared in glibc in version 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 
   

CONFORMING TO

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

SEE ALSO

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

COLOPHON

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                              2015-04-19                          CASIN(3)

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