3 4) f(2)=2²³ +2² (xtiy)² + 2i 3 x²y³²x³²+(y) ³+ 3x² (13) +3[iy)² x + 2i (x² iy²³ + 3x²iy (3y²x + Zi X3x = x³-3y²x +i Ux = 3x²-3y² w ally = -6yx ила и Vx= 6xy mon Vy = 3x²-3y² u(x,y)=x²-3y²x V(x, y) = 3x²y-y²³ +2 (3x²y-y³+2), V Ux= Vy (✓) Uly = -√x (✓)

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