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If In=intdx/(x^2+a^2)^n,ninN, then show ...

If `I_n=intdx/(x^2+a^2)^n,ninN`, then show that: `I_(n+1)=1/(2na^2)x/((x^2+a^2)^n)+(2n-1)/(2n). 1/a^2I_n`

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