Question: Solve the differential equation using (a) undetermined coefficients and (b) variation of parameters. 4y'' + y = cos x

Solve the differential equation using (a) undetermined coefficients and (b) variation of parameters.

4y'' + y = cos x 

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a Here 4r 1 0 Ypx 4y y cos x becomes 4A cos x B sin x A cos x B sin x cos x or 3... View full answer

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