Use a computer as a computational aid. Use U₁+1,j + Ujj+1 + Uj−1, j + Uj,j−1 − 4u₁₁j = 0 to approximate the solution of Laplace's equation at the interior points of the given region. Use symmetry when possible. (Assume 40o = u(0, 0).) U11 = U21 = U31 = u(0, y) = 0, u(2, y) = 0, 0

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