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cos4π7+cos43π7+cos45π7\cos^{ 4} \dfrac{\pi}{7} + \cos^{4} \dfrac{ 3 \pi}{7} + \cos^{4} \dfrac{5 \pi}{7} cos47π+cos473π+cos475π
If the above expression is equals to ab \dfrac {a}{b} ba where aaa and bbb are coprime positive.
Find a+ba+ba+b.
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