Simplify $\cos 10^\circ \cos 30^\circ \cos 50^\circ \cos 70^\circ.$
Question:
Simplify $\cos 10^\circ \cos 30^\circ \cos 50^\circ \cos 70^\circ.$
Answer:
Let's think step by step.

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Simplify $\cos 10^\circ \cos 30^\circ \cos 50^\circ \cos 70^\circ.$
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