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Let the function

f(?)=?????sin?sin(?6/)sin(?3/)cos?cos(?6/)cos(?3/)tan?tan(?6/)tan(?3/)?????

where ??[?6,?3] and f'(?) denote the derivative of *f* with respect to *?*. Which of the following statements is/are **TRUE?**

(I) There exists ??[?6,?3] such that f'(?) =0.

(II) There exists ??[?6,?3] such that f'(?) ?0.

*f*with respect to

*?*. Which of the following statements is/are

**TRUE?**

(A) I only | (B) II only | (C) Both I and II | (D) Neither I nor II |

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