Question: roblem 4. Find all x in (-00, co) for which the tangent is horizontal. f(x) = 2x + 2cosx - 4sinx - cos 2x; [0,

roblem 4. Find all x in (-00, co) for which the

roblem 4. Find all x in (-00, co) for which the tangent is horizontal. f(x) = 2x + 2cosx - 4sinx - cos 2x; [0, 7]. spiny llenev ann

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