Important Notes :-.
1.(a-b)^2= a^2+b^2-2ab
2.(a+b)^2= a^2+b^2+2ab
3.(a+b)^3= a^3+b^3+3ab(a+b)
*a^3+b^3= (a+b)^3+3ab(a+b)
4.3(a-b)^3= a^3-b^3-3ab(a+b)
*a^3-b^3= (a-b)^3+3ab(a+b)
5.a^2-b^2= (a-b)(a+b)
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