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Exact differential equation (view source)

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Suppose you are given an equation of the form:

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:<math>M(t,y) + N(t,y)y' = 0\,</math>

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:<math>M(t,y) + N(t,y)y' = 0\,</math> or <math>M(t,y) dt + N(t,y) dy = 0\,</math>

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or

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:<math>M(t,y) dt + N(t,y) dy = 0\,</math>

To find the solution of this equation, we assume that the solution is φ = constant. This means that:

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