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4) Determine whether u = sin(x) cosh(y) + cos(x) sinh(y) is a solution of Laplace's equation u +u = 0. xx yy 5) Determine the

4) Determine whether u = sin(x) cosh(y) + cos(x) sinh(y) is a solution of Laplace's equation u +u = 0. xx yy 5) Determine the equation of the plane tangent to z = In(x - 2y) at the point (3, 1, 0)

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