$\cos \frac{\pi}{10} \cos \frac{2\pi}{10} \cos \frac{4\pi}{10} \cos \frac{8\pi}{10} \cos \frac{16\pi}{10}$ का मान है
- A$\frac{1}{32}$
- B$\frac{1}{16}$
- C$\frac{\cos(\pi/10)}{16}$
- D$-\frac{1}{16}$
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