Given: phi(x,y) satisfies Laplace’s Equation, show that Psi(x,y)=(x^2+y^2)*phi(x,y) satisfies the biharmonic equation. x,y) Setisfics satisfies the...

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Given: phi(x,y) satisfies Laplace’s Equation, show that Psi(x,y)=(x^2+y^2)*phi(x,y) satisfies the biharmonic equation.

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