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   cos

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

   Description
   The function cos calculates the cosine of the floating point  argument
   x where x is in radians.

   Example
   #include <math.h>
   #include <stdio.h>
   main()
   {
   double value = 2.5556,result;
        result = cos(value);
        printf("The cosine of %f is %f\n",value,result);
   }

   Return Value
   cos  returns the cosine of x. Zero is returned on error and  errno  is
   set. Error handling can be modified with matherr.