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cos(2π15)cos(4π15)cos(8π15)cos(14π15)=AB\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}cos(152π)cos(154π)cos(158π)cos(1514π)=BA
If A,BA,BA,B are co-prime integers , find B−AB - AB−A.
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