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Program to Calculate the Sum of cos(x) Series



Program to Calculate the Sum of cos(x) Series

    #include <stdio.h>

    #include <math.h>     

    void main()

    {

        int n, x1, k, j;

        float x, sign, cosx, fact;
     

        printf("Enter the number of the terms in a series\n");

        scanf("%d", &n);

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

        scanf("%f", &x);

        x1 = x;

    	/*  Degrees to radians */

        x = x * (3.142 / 180.0);

        cosx = 1;

        sign = -1;

        for (k = 2; k <= n; k = k + 2)

        {

            fact = 1;

            for (j = 1; j <= k; j++)

            {

                fact = fact * j;

            }

            cosx = cosx + (pow(x, k) / fact) * sign;

            sign = sign * (-1);

        }

        printf("Sum of the cosine series = %7.2f\n", cosx);

        printf("The value of cos(%d) using library function = %f\n", x1,

        cos(x));

    }

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