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Answers for “为什么项 -xy 在最终解中只包含一次?”

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Understand why

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The term -xy appears in both the integration of M with respect to x and the integration of N with respect to y. When combining the results to form the potential function, shared terms should only be included once to avoid double-counting.

Conditions: The term -xy is present in both antiderivatives.

Meet the concept

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The final implicit solution for the example equation (-3x^2 - y)dx+(3y2−x)dy=0dx + (3y^2 - x)dy = 0 is -x^3+y33 + y^3 - xy = C.

Conditions: The equation is exact.; The terms are combined correctly without double-counting.

Understand why

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When integrating a multivariable function with respect to one variable, the other variables are treated as constants. Therefore, the 'constant' of integration can be any function that depends only on the other variables, which in this case is y.

Conditions: The integration is with respect to x.; The function M depends on both x and y.

Meet the concept

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The steps involve finding the potential function F(x,y)F(x,y) by integrating M with respect to x and N with respect to y, then combining the results to form the implicit solution F(x,y)=CF(x,y) = C.

Conditions: The differential equation has been verified as exact.