#include<stdio.h>
#include<math.h>
int fact(int);
main()
{
int n,i,j=1;
float x,sum=0;
printf("enter the value of x");
scanf("%f",&x);
printf("enter no. of terms");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
sum=sum+(float)(j*((float)pow(x,2i-1)/fact(2i-1)));
if(j==1)
j=-1;
else
j=1;
}
printf("sum of series is %f",sum);
}
int fact(int i)
{
if(i==0||i==1)
return 1;
else
return (i*fact(i-1));
}