Bingo

Geometry Level 3

sin(π5)sin(2π5)sin(3π5)sin(4π5)\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 AB\dfrac AB for coprime positive integers AA and BB, submit your answer as BAB - A.

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