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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)
Y^9*((9*x^6*y^10)/(x^0)) = 0
9*Y^9*x^6*y^10 = 0
9*Y^9*x^6*y^10 = 0 // : 9*Y^9*y^10
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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