If \( \alpha=\frac{\pi}{15} \), prove that \( \cos 2 \alpha \cos 4 \alpha \cos 8 \alpha \cos 14 ...
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If \( \alpha=\frac{\pi}{15} \), prove that \( \cos 2 \alpha \cos 4 \alpha \cos 8 \alpha \cos 14 \alpha=\frac{1}{16} \)
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