# Bingo

Geometry Level 3

$\sin \left( \frac{\pi}{5} \right) \sin \left( \frac{2\pi}{5} \right) \sin \left( \frac{3\pi}{5} \right) \sin \left( \frac{4\pi}{5} \right)$

If the value of the expression is equals to $\dfrac AB$ for coprime positive integers $A$ and $B$, submit your answer as $B - A$.

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