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#include <iostream>
using namespace std;
int power(int x, int y)
{
if(y==0)
return 1;
for(int i=1;i<=y;i++)
x*=x;
return x;
}
int fact(int x)
{
int fact=1;
for(int i=x;i>0;i--)
fact*=i;
return fact;
}
int main() {
int i=0,xp=0,yp=0,x,y,n,sign=1;
float sum=0;
cout<<"Enter value for x,y,n";
cin>>x>>y>>n;
for(i=0;i<n;i++)
{
if(i==0)
sum=1;
else
sum+=sign*(power(x,xp)*power(y,yp))/fact(2*i
if(i%2==0)
xp++;
else
yp++;
sign*=-1;
}
cout<<"final sum="<<sum;
return 0;
}