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 sin()                   Calculate Sine

 #include   <math.h>

 double     sin(x);
 double     x;                           Angle, in radians

    sin() returns the sine of 'x' radians.

    Returns:    Sine of 'x'.  If 'x' is large, there may be a partial
                loss of significance in the result, in which case
                matherr() is called with a PLOSS error, 'errno' (defined
                in <stdlib.h>) is set to ERANGE (defined in <math.h>),
                and the partially insignificant result is returned.  If
                'x' is large enough to cause a total loss of
                significance, then matherr() is called with a TLOSS
                error, a TLOSS error message is printed to 'stderr',
                'errno' is set to ERANGE, and 0.0 is returned.

      Notes:    Error handling can be modified by using the matherr()
                function. PLOSS first occurs with 'x' greater than 1.0E8.
                TLOSS first occurs with 'x' greater than 2.0E9.

   -------------------------------- Example ---------------------------------

    Example  The following statements print the sine of pi/2 radians and
    2.6e8 pi radians and check for any loss of significance.

           #include <math.h>       /* for sin() and ERANGE */
           #include <stdio.h>      /* for printf() */
           #include <stdlib.h>     /* for errno */

           main()
           {
               double sine, pi = 3.1415926535;

               sine = sin(pi/2.0);
               printf("sine of pi/2 = %e\n", sine);
               errno = 0;
               sine = sin(2.6e8 * pi);
             /*if a TLOSS error occurs, a message is also printed to stderr*/
               if (errrno == ERANGE)
                   printf("ERANGE error in sin()\n");
               printf("sine of 2.6e8 * pi = %e\n", sine);
           }