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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(x/x) = 0.5 // - 0.5
1-(x/x)-0.5 = 0
1-1-0.5 = 0
-0.5 = 0
x belongs to the empty set
x belongs to the empty set
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