Question: Repeat Exercise 3 with f (x, y) = 252 cos 5/2 x cos 5/2 y, using the Neumann boundary condition u / n (x, y)

Repeat Exercise 3 with f (x, y) = −25π2 cos 5π/2 x cos 5π/2 y, using the Neumann boundary condition
∂u / ∂n (x, y) = 0.

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