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simplify: (a^2/b^2+b^2/a^2-(a/b+b/a))/((a/b+b/a+1)(1/a-1/b)^2)
simplify: (a^2/b^2+b^2/a^2-(a/b+b/a))/((a/b+b/a+1)(1/a-1/b)^2)
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