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8ab(a^2+b^2) =4ab. 2(a^2+b^2) =(a+b)^2-(a-b)^2.( a+b)^2+(a-b)^2 =(rut7)^2- (rut5)^2. (rut7)^2+(rut5)^2 =(7-5).(7+5) =2.12 =24...

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