`1/7 [ (1)/(x^(2)+9)-(1)/(x^(2)+16)]``1/9 [ (1)/(x^(2)+9)-(1)/(x^(2)+16)]``1/7 [ (1)/(x^(2)+16)-(1)/(x^(2)+9)]``1/25 [ (1)/(x^(2)+9)-(1)/(x^(2)+16)]`
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