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JEE MATHEMATICS MCQ: INDEFINITE INTEGRATION

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Analyzing +4 | -1
∫(cos⁡x−cos⁡3x1−cos⁡3x)1/2dx=\int\left(\frac{\cos x-\cos ^3 x}{1-\cos ^3 x}\right)^{1 / 2} d x=
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Correct option: B
−23Sin⁡−1(cos⁡3/2x)+c-\frac{2}{3} \operatorname{Sin}^{-1}\left(\cos ^{3 / 2} x\right)+c
Option C (13sin⁡3x−sin⁡x\frac{1}{3} \sin ^3 x-\sin x) is correct because after integrating and comparing with the given form, g(x) matches this expression.

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