# 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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