differential equations

Differential equations and first-order linear equations have only one arbitrary constant: y' p(x)y=q(x). Note: The absolute value can be omitted when calculating ∫p(x)dx. The second-order reducible differential equation: y''=f(y,y') type/y''=f(x,y') type/y''=f(y') type, can be reduced to the above two Use any type to find it, but generally use [missing y type].

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