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1. Verify if the following function is harmonic 2. Verify if the following function is harmonic 2 U(x, y) = ln x + y

1. Verify if the following function is harmonic 2 2U(x, y) = In Vx? x + y - y? =

2. Verify if the following function is harmonic U(x,y)= * cos(y) – e cos(x) =

2 U(x, y) = ln x + y

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