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[(3/(a-b)-(3a)/(b^3-a^3 )∙(a^2+ab+b^2)/(a+b))∙(a^2+2ab+b^2)/(2a+b)]∙2/(a+b
[(3/(a-b)-(3a)/(b^3-a^3 )∙(a^2+ab+b^2)/(a+b))∙(a^2+2ab+b^2)/(2a+b)]∙2/(a+b
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