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[tex]( \frac{a^2+b^2}{ab} -2):( \frac{2a^2+2ab}{a^2+2ab+b^2}-1)*( \frac{1}{a+b} + \frac{2b}{a^2-b^2} )* \frac{ab}{a+b} [/tex]
[tex]( \frac{a^2+b^2}{ab} -2):( \frac{2a^2+2ab}{a^2+2ab+b^2}-1)*( \frac{1}{a+b} + \frac{2b}{a^2-b^2} )* \frac{ab}{a+b} [/tex]
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