1.

Date____/_-_1.22862

Answer»

((a+b)(a+b)+(a-b)(a-b))/(a*a+b*b) = (a*a+2ab+b*b+a*a-2ab+b*b)/(a*a+b*b) = (2a*a+2b*b)/(a*a+b*b) = 2(a*a+b*b)/(a*a+b*b) = 2

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