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Evaluate
∫011−x1+x dx. \int_0^1 \sqrt{ \frac{1-x}{1+x} } \, dx. ∫011+x1−xdx.
A. π2+1 \frac{\pi}{2} +1 2π+1 B. π2−1 \frac{ \pi}{2} - 1 2π−1 C. -1 D. 1
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