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CASIN(3)                   Linux Programmer's Manual                  CASIN(3)



NAME
       casin, casinf, casinl - complex arc sine

SYNOPSIS
       #include <&lt;complex.h>&gt;

       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))

CONFORMING TO
       C99.

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

COLOPHON
       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



                                  2007-12-26                          CASIN(3)