# Sum of cosines and product of sines

$\large{\dfrac{\cos(12^{\circ})+\cos(84^{\circ})+\cos(156^{\circ})+\cos(132^{\circ})}{\sin(6^{\circ}) \sin(42^{\circ}) \sin(66^{\circ}) \sin(78^{\circ})}= \ ? }$

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