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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((((x^1)/2)*x^1)/2)/x = 0
(((x/2)*x)/2)/x = 0
1/4*x = 0 // : 1/4
x = 0
x in { 0}
x belongs to the empty set
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