definite-integral

Question: $\int_{0}^{1}{\sqrt{\frac{1-x}{1+x}}}\,dx$ equals



1) $\left( \frac{\pi }{2}-1 \right)$
2) $\left( \frac{\pi }{2}+1 \right)$
3) $\frac{\pi }{2}$
4) $(\pi +1)$
Solution: Explanation: No Explanation
Fundamental definite integration Definite integration by substitution

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