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D( x )
x^4*((6*x^6)/2) = 0
x^4*((6*x^6)/2) = 0
x^4*((6*x^6)/2) = 0
3*x^10 = 0 // : 3
x^10 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^4*((6*x^6)/2))^-4 = 0
1/81*x^-40 = 0 // : 1/81
x^-40 = 0
x naleu017Cy do O
x belongs to the empty set
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