simplify (a+ b)^2 + (a-b)^2
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(a+b)2-2ab
={(a+b)+(a-b)}-2*(a+b)(a-b)
(a+b-a-b) -2*(a2+ab+ba-b2)
-2*(a2+2ab-b2)
-2a2-4ab+2b2
={(a+b)+(a-b)}-2*(a+b)(a-b)
(a+b-a-b) -2*(a2+ab+ba-b2)
-2*(a2+2ab-b2)
-2a2-4ab+2b2
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