Code:
#include stdio.h
#include math.h
#include stdlib.h
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));
}
Output:
Enter the value of x (in degrees)
60
Enter the accuracy for the result
0.86602
Sum of the cosine series = 0.451546
Using Library function cos(60) = 0.499882
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