## Find the sum of cos(x) series

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/* Write a 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; //accepts floating values 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; x = x * (3.142/180.0); /* Degrees to radians*/ 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,cos(x)); } /*End of main() */ /*-------------------------------------------------------- Output Enter the number of the terms in a series 5 Enter the value of x(in degrees) 60 Sum of the cosine series = 0.50 The value of cos(60) using library function = 0.499882 --------------------------------------------------------*/ |