Trigonometry (4)

Geometry Level 4

\[\cos \dfrac{π}{65} \cos \dfrac{2π}{65} \cos \dfrac{4π}{65} \cos \dfrac{8π}{65} \cos \dfrac{16π}{65} \cos \dfrac{32π}{65} \]

Find the value of the expression above to 4 decimal places.

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