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D( x )
x^1 = 0
x^1 = 0
x^1 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^1*((x^2)/3))/6)/(x^1))/2 = 0
(((x*((x^2)/3))/6)/x)/2 = 0
1/36*x^2 = 0 // : 1/36
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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