Simplify[-(Sec[2 x](-2+8 C1+Log[Cos[2 x]]+Cos[4 x](8 C1+Log[Cos[2 x]])+2 (-2 C2+x) Sin[4 x]))/2 +Cos[2 x](8 C1+Log[Cos[2 x]])+2 (-2 C2+x)Sin[2 x]]

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