3. Elliptic equation. Given the harmonic Laplace function u(x,y) in the rectangle R = {(x,y): 0≤x≤ 3,0 ≤ y ≤3}. The boundary values are u(x, 3) = 80 and u(0, y) = 40 and The grid is given as a. 11,3 11,2 112,4 95 ● 93 u₁(x,0)=130 u(3,y)=10 U13,4 96 94 for 0

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