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