Sin value

Geometry Level 3

\[\large \sin\left(\dfrac { \pi }{ 14} \right)\sin\left(\dfrac { 3\pi }{ 14 }\right) \sin\left(\dfrac { 5\pi }{ 14 }\right) \sin\left(\dfrac { 7\pi }{ 14 }\right) = \ ?\]

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