Cos Sine to the tan limit

Calculus Level 2

limx0(cos4(3x)+cosx2cos(2x))1tan(x)= ? \large \lim_{ x \to 0} \left(\frac{ \cos ^4 (3x) + \cos x}{2\cos (2x)} \right) ^{\frac{1}{\tan (x)}} = \ ?

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