If \( 0\alpha\pi / 2 \) then the value of \( \int_{0}^{\alpha} \fra...
If \( 0\alpha\pi / 2 \) then the value of \( \int_{0}^{\alpha} \frac{d x}{1-\cos x \cos \alpha} \) is
(a) \( \pi / \alpha \)
(b) \( \pi / \sin \alpha \)
(c) \( \pi / \cos \alpha \)
(d) \( \pi / 2 \alpha \)
\( \mathrm{P} \)
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