Product Of Cosines

Geometry Level 2

Evaluate

\[ \cos 10^\circ \times \cos 20 ^ \circ \times \cos 30 ^ \circ \times \cos 40 ^ \circ \times \cos 50^\circ \times \cos 60 ^ \circ \times \cos 70 ^ \circ \times \cos 80 ^ \circ. \]

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