i:u(x,y)=x2โy2v(x,y)=2xyโxโuโ=2x,โyโuโ=โ2yโxโvโ=2y,โyโvโ=2xโxโuโ=โyโvโ,โyโuโ=โโxโvโโfisanalyticii:u(x,y)=x2+y2v(x,y)=โ2xyโxโuโ=2xโyโvโ=โ2xโxโuโ๎ =โyโvโโfisnotanalytic
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