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## Main Question or Discussion Point

how do you spot that a D.E. needs an integrating factor, besides experience?

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how do you spot that a D.E. needs an integrating factor, besides experience?

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Zurtex

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[tex]\frac{dy}{dx} + Py = Q[/tex]

Where P and Q are functions of x.

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thanks! :)

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HallsofIvy

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The hard part is finding that integrating factor.

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mathwonk

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HallsofIvy

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If a first order differential equation is

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thank you!!!

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