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D( x )
24*x^4 = 0
24*x^4 = 0
24*x^4 = 0
24*x^4 = 0 // : 24
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(6/(24*x^4))*x^4 = 0
1/4 = 0
x belongs to the empty set
x belongs to the empty set
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