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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^3-4000)/(x^2) = 0
2*x^3 = 4000 // : 2
x^3 = 2000
x^3 = 2000 // ^ 1/3
x = 10*2^(1/3)
x = 10*2^(1/3)
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