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C++ Program to calculate (a - b)³.

Let see the program to calculate (a - b)³.

Example:

To calculate (a - b)3.
Formula: (a - b)3 =a3 – 3*a2*b + 3*a*b2 – b3 
Input a=1,b=2
(a - b)3 =-1

#include <iostream>

using namespace std;
int main()
{
    int a,b,result;
    cout<<"Enter a value :";
    cin>>a;
    cout<<"Enter b value :";
    cin>>b;
    result=a*a*a -b*b*b -3*a*a*b +3*a*b*b;
    cout<<" Result (a - b)^3 = :"<<result<<endl;
    return 0;
}

Output:

 Enter a value :1
 Enter b value :2

 Result (a - b)^3 = :-1

#include <iostream>

using namespace std;
int main()
{
    int a,b,result;
    cout<<"Enter a value :";
    cin>>a;
    cout<<"Enter b value :";
    cin>>b;
    result=a*a*a -b*b*b -3*a*b*(a -b);
    cout<<" Result (a - b)^3 = :"<<result<<endl;
    return 0;
}

Output:

 Enter a value :5
 Enter b value :7

 Result (a - b)^3 = :-8

/* C++ Program to calculate (a-b)3 using pow() function. */
#include <iostream>

using namespace std;
#include <math.h>
int main()
{
    int a,b,result;
    cout<<"Enter a value :";
    cin>>a;
    cout<<"Enter b value :";
    cin>>b;
    result=pow(a,3) - 3*pow(a,2)*b + 3*a*pow(b,2) - pow(b,3)  ;
    cout<<" Result (a - b)^3 = :"<

Output:

 Enter a value :8
 Enter b value :3

 Result (a - b)^3 = :125

/* C++ Program to calculate (a-b)3 using pow() function. */
#include <iostream>

using namespace std;
#include <math.h>
int main()
{
    int a,b,result;
    cout<<"Enter a value :";
    cin>>a;
    cout<<"Enter b value :";
    cin>>b;
    result=pow(a,3) -pow(b,3) -3*a*b*(a -b);
    cout<<" Result (a - b)^3 = :"<<result<<endl;
    return 0;
}

Output:

 Enter a value :10
 Enter b value :4

 Result (a - b)^3 = :216

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