Here is source code of the C program to C Program calculates the sum of cos(x) series. The C program is successfully compiled and run on a Linux system. The program output is also shown below.
* C program to find the sum of cos(x) series
int n, x1, i, j;
float x, sign, cosx, fact;
printf("Enter the number of the terms in a series\n");
printf("Enter the value of x(in degrees)\n");
x1 = x;
/* Degrees to radians */
x = x * (3.142 / 180.0);
cosx = 1;
sign = -1;
for (i = 2; i <= n; i = i + 2)
fact = 1;
for (j = 1; j <= i; j++)
fact = fact * j;
cosx = cosx + (pow(x, i) / 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,
$ cc pgm63.c -lm $ a.out Enter the number of the terms in a series 3 Enter the value of x(in degrees) 90 Sum of the cosine series = -0.23 The value of cos(90) using library function = -0.000204
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