Question: Find the general solution ofy+9y =2 sec 3xusing the method of variation of parameters.Ans: y(x)= C1 cos 3x + C2 sin 3x +(2/3)x sin 3x

Find the general solution ofy+9y =2 sec 3xusing the method of variation of parameters.Ans: y(x)= C1 cos 3x + C2 sin 3x +(2/3)x sin 3x +(2/9) cos 3x ln | cos 3x|

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