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Sines are sinister

Geometry Level 3

\[\large{\prod _{ k=1 }^{ 8 }{ \left( \sin { \left( \frac { k\pi }{ 18 } \right) } \right) } = \ ?}\]

\[\dfrac{3}{256}\] \[\dfrac{1}{256}\] \[\dfrac{4}{256}\] \[\dfrac{2}{256}\]

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by Lakshya Sinha

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