casin, casinf, casinl – complex arc sine

USAGE
       #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 asin().  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)