Answer to Question #78511 in Differential Equations for Prince

Differential Equations

Question #78511

Solve ∂^2U/∂x^2=9(∂^2U/∂x^2)

1. Cos(3x - y)
2. x^2 + y^2
3. Sin (3x - y)
4. e^-3/pix Sin(piy)

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