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D( x )
x^1 = 0
x^1 = 0
x^1 = 0
x = 0
x in (-oo:0) U (0:+oo)
((4*x)/(x^1))/3 = 0
((4*x)/x)/3 = 0
4/3 = 0
x belongs to the empty set
x belongs to the empty set
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