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                     these are some of the basic formula
1.. (a−b)2=a2+b22ab
2. (a3–b3)=(a−b)(a2+ab+b2)
4. (a3+b3)=(a+b)(a2−ab+b2)  
5 If a+b+c=0, then a3+b3+c3=3abc.

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