January 2020 1 189 Report
Mostrar que as funcoes seguintes sao harmonicas:

A) u= x^{2}+2x-y^{2}

B) u= arctg\frac{y}{x}

C) u=ln(x^{2}+y^{2})

D) u=\frac{x}{x^{2}+y^{2}}
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