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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^0*((16*x^2)/8) = 0
(16*x^2)/8 = 0
2*x^2 = 0 // : 2
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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