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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x^3-x^2)/(x^2) = 0
2*x^3-x^2 = 0
x^2*(2*x-1) = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x^2*(x-1/2) = 0
x-1/2 = 0
x-1/2 = 0 // + 1/2
x = 1/2
x = 1/2
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