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11. One solution of the differential equation y + y'=0 is y= cosx. Find the other fundamental solution.? 12. Two linearly independent solutions of

11. One solution of the differential equation y" + y'=0 is y= cosx. Find the other fundamental solution.? 12. Two linearly independent solutions of the differential equation y"-4y' + 5y = 0 are ? 13. The solution of the differential equation xy"-5xy' + 5y = 0 is? 14. Without solving for the undetermined coefficients, the correct form of a particular solution of the differential equation y" +6y' +13y=e* cos(2x) is?

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