Question: Please answer questions 11, 12, and 13 step by step. Please provide a description to it. Also, please clear handwriting 11) Solve y + 6y

Please answer questions 11, 12, and 13 step by step. Please provide a description to it.

Also, please clear handwriting

11) Solve y" + 6y" + 13y' + 10y = cos x by the method of undetermined coefficients. (Hint: solutions to the homogeneous equation are: 1 = -2, 1 = -2 + i, 1 = -2 -i) 12) Solve y() -13y" + 36y = cos x by the method of undetermined coefficients. 13) Solve y" - y" - y' + y = ex by the method of variation of parameters. (You may use an integral table to help you but make sure to state the formulae that you use)

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