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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((6^-2*x^-4)^1)/2 = 0
(6^-2*x^-4)/2 = 0
1/72*x^-4 = 0 // : 1/72
x^-4 = 0
x naleu017Cy do O
x belongs to the empty set
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