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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-1)/4)*((2*x^9)/4) = 0
1/8*x^8 = 0 // : 1/8
x^8 = 0
x = 0
x in { 0}
x belongs to the empty set
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