A geometry problem by Pranay Garg

Geometry Level pending

Find

\(\cos 5^{\circ} * \cos 10^{\circ} * \cos 15^{\circ} * \cos 20^{\circ} * \cos 25^{\circ} * \cos 30^{\circ} *\cdots * \cos 85^{\circ} * \cos 90^{\circ}\).

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