Question

write c program to find the value of cos x​

Answer 1

void main()

{

   int n, x1;

   float accuracy, term, denominator, x, cosx, cosval;

 

   printf("Enter the value of x (in degrees) \n");

   scanf("%f", &x);

   x1 = x;

   /*  Converting degrees to radians */

   x = x * (3.142 / 180.0);

   cosval = cos(x);

   printf("Enter the accuracy for the result \n");

   scanf("%f", &accuracy);

   term = 1;

   cosx = term;

   n = 1;

   do

   {

       denominator = 2 * n * (2 * n - 1);

       term = -term * x * x / denominator;

       cosx = cosx + term;

       n = n + 1;

   } while (accuracy <= fabs(cosval - cosx));

   printf("Sum of the cosine series = %f\n", cosx);

   printf("Using Library function cos(%d) = %f\n", x1, cos(x));

}