Find the steady periodic solution Xp (t) = C cos (ot-a) of the given equation mx'' + cx' + kx = F(t) with periodic forcing function F(t) of frequency Then graph Xp (t) together with (for comparison) F(t) mo the adjusted function F₁ (t) = x' + 6x' + 9x = 11 cos 2t Xsp (t) = (Use integers or decimals for any numbers in the expression. Round to three decimal places as needed.)

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