The set of values of \( x \) for which \( \sin x \cdot \cos ^{3} x\...

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The set of values of \( x \) for which \( \sin x \cdot \cos ^{3} x\cos x \cdot \sin ^{3} x, 0 \leq x \leq 2 \pi \), is
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(a) \( (0, \pi) \)
(b) \( \left(0, \frac{\pi}{4}\right) \)
(c) \( \left(\frac{\pi}{4}, \pi\right) \)
(d) none of these
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