If \( \pi / 2\alpha\pi \), then the expression \( \left|\sqrt{\frac...

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If \( \pi / 2\alpha\pi \), then the expression
\( \left|\sqrt{\frac{1-\sin \alpha}{1+\sin \alpha}}+\sqrt{\frac{1+\sin \alpha}{1-\sin \alpha}}\right| \) is equal to
(a) \( 2 / \cos \alpha \)
(b) \( -2 / \cos \alpha \) (c) \( 2 / \sin \alpha \) (d) \( 2 \tan \alpha \)
W)
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