trigonometry

Question: $\sin 12{}^\circ \sin 24{}^\circ \sin 48{}^\circ \sin 84{}^\circ =$

1) $\cos 20{}^\circ \cos 40{}^\circ \cos 60{}^\circ \cos 80{}^\circ $

2) $\sin 20{}^\circ \sin 40{}^\circ \sin 60{}^\circ \sin 80{}^\circ $

3) $\frac{3}{15}$

4) None of these

Solution:

Explanation: No Solution

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