definite-integral

Question: If ${{u}_{n}}=\int_{0}^{\pi /4}{{{\tan }^{n}}x\,dx,}$ then ${{u}_{n}}+{{u}_{n-2}}=$



1) $\frac{1}{n-1}$
2) $\frac{1}{n+1}$
3) $\frac{1}{2n-1}$
4) $\frac{1}{2n+1}$
Solution: Explanation: No Explanation
Properties of definite integration

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