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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)
Y = 6-((x^3)/(x^2)) // - 6-((x^3)/(x^2))
Y+(x^3)/(x^2)-6 = 0
Y+x-6 = 0 // - Y-6
x = -(Y-6)
x = 6-Y
x = 6-Y
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