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A trick problem !!

Geometry Level 2

Given that, $\large \cos \frac{\pi}{28} \cos \frac{2 \pi}{28} \cos \frac{3 \pi}{28} .... \cos \frac{28 \pi}{28}=a$ .

Find the value of $a$ .

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Excel in math and science

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by Prasun Biswas

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