Variation of parameters: Difference between revisions

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A surprisingly large number of punctuation corrections, and a few other coyp-edits.
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=== Specific second order equation ===
Let us solve
:<math> y''+4y'+4y =coshx \cosh x</math>
 
We want to find the general solution to the differential equation, that is, we want to find solutions to the homogeneous differential equation