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