Calculate first order partial derivatives of a function "z = x^{2}y - 4x\\sqrt{y} - 6y^{2} + 5" at the point M(2;1)
"z_x=2xy-4\\sqrt{y}"
"z_x(2,1)=2\\cdot2-4\\sqrt{1}=0"
"z_y=x^2-2x\/\\sqrt{y}-12y"
"z_y(2,1)=2^2-2\\cdot2-12=-12"
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