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I was doing a few homework questions and I came about a few ODEs of this form.

For example,

(XD^3 + 4D^2)y = 8e^x

Im not sure what the D stands for, is it a constant, is it a derivative of y (ie. y'''), etc. ??

In the same section of problems there were questions that I solved using undetermined coefficient method by finding both the homogenous and particular solutions.

Any help would be appreicated.

AB

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