If \( I_{n}=\int \frac{d x}{\left(x^{2}+a^{2}\right)^{n}} \) then b...

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If \( I_{n}=\int \frac{d x}{\left(x^{2}+a^{2}\right)^{n}} \) then by using reduction
\( \mathrm{P}^{13} \)
WV formula, show that
\[
I_{n}=\frac{x}{\left(x^{2}+a^{2}\right)^{n}}+2 n I_{n}-2 n a^{2} I_{n+1}
\]
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