# C Program to Calculate the Sum of Cos x Series

C Program to Calculate the Sum of Cos x Series

C Program For Bubble Sort and Binary Search: Click Here

```
/*
* C program to find the sum of cos(x)
```

series */ #include <stdio.h> #include <math.h> void main() { int n, x1, i, j; float x, sign, cosx, fact; printf("Enter the number of the

terms in a seriesn"); 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 (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

= %7.2fn", cosx); printf("The value of cos(%d) using

library function = %fn", x1, cos(x)); }

` `

`Output`

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