Y=1/3 x^3-2x^2 производную
y=1/3 x^3-2x^2
y' = 1/3*3x^2 - 2*2x = x^2 - 4x
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Y'=1/3*3x^2-2*2x=x^2-2x=x(x-2) x(x-2)=0 x=0 x=2