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Prove by mathematical induction.`1/1.3+1/3.5+1/5.7+....+1/((2n-1)(2n+1))=n/(2n+1)`

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Prove by mathematical induction that 1/1.3+1/3.5+1/5.7+...+1/((2n-1)(2n+1)) = n/(2n+1),(n in N)

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