\( \int \sqrt{\frac{\cos x-\cos ^{3} x}{1-\cos ^{3} x}} d x \) is equal to (A) \( \frac{2}{3} \s...

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\( \int \sqrt{\frac{\cos x-\cos ^{3} x}{1-\cos ^{3} x}} d x \) is equal to
(A) \( \frac{2}{3} \sin ^{-1}\left(\cos ^{3 / 2} x\right)+C \)
(B) \( \frac{3}{2} \sin ^{-1}\left(\cos ^{3 / 2} x\right)+C \)
(C) \( \frac{2}{3} \cos ^{-1}\left(\cos ^{3 / 2} x\right)+C \)
(D) none of these
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