\[\large\cos\left(\dfrac{2\pi}{15}\right)\cos\left(\dfrac{4\pi}{15}\right)\cos\left(\dfrac{8\pi}{15}\right)\cos\left(\dfrac{14\pi}{15}\right)=\dfrac{A}{B}\]

If \(A,B\) are co-prime integers , find \(B - A\).

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