4) Solve Poisson problem for a=lı b=l ↑u (x₁b) = f₂(x) ty b (0₁4)=9₁(y) 0 Ou=f(x,y) u(a.y) = 9₂ (9) xx a u(x₁) = f(x) Figure 1. f(x,y) = sin2TX₁ f₁= £₂=0, 9₁=9₂=0 using one dimensional eigen function expansion. 1

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