a^2+b^2/2a+2b + b/(a+b)=a^2+b^2/2(a+b) + b*2a/(a+b)=a^2+b^2+2ab/2ab(a+b)=(a+b)^2/2ab(a+b)=a+b/2ab;
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a^2+b^2/2a+2b + b/(a+b)=a^2+b^2/2(a+b) + b*2a/(a+b)=a^2+b^2+2ab/2ab(a+b)=(a+b)^2/2ab(a+b)=a+b/2ab;