$\int\left(\sqrt{\frac{a+x}{a-x}}+\sqrt{\frac{a-x}{a+x}}\right) d x$ is equal to
- A$2 \sin ^{-1}\left(\frac{x}{a}\right)+C$
- B$2 a \sin ^{-1}\left(\frac{x}{a}\right)+C$
- C$2 \cos ^{-1}\left(\frac{x}{a}\right)+C$
- D$2 a \cos ^{-1}\left(\frac{x}{a}\right)+C$
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