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   asin

   Usage
   #include <math.h>
   double asin(double x);

   Description
   asin  returns the arc sine of x in the range of  -pi/2<=asin<=pi/2.
   The value of x must be between -1<=x<=1.

   Example
   #include <math.h>
   #include <stdio.h>
   main()
   {
   double x, y;
        x = .94;
        y = asin(x);
        printf("The arc sine of %f is %f\n",x,y);
   }

   Return Value
   asin  returns  the arc sine of the input value. If the value  is  less
   than  -1 or greater than 1, asin sets errno to EDOM, prints  a  DOMAIN
   error message to stderr and returns 0. Error handling can be  modified
   through the function matherr.