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NNNLLL54

Z=3x^3+4y^2; ; ,; ; K(-4;-2)\\\Z'_{x}=9x^2; ; ,; ; Z'_{x}(K)=9cdot (-4)^2=144\\Z'_{y}=8y; ; ;; ; ; Z'_{y}(K)=8cdot (-2)=-16\\\grad, Z(K)=144vec{i}-16vec{j}

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