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D( x )
(3*x^5)^3 = 0
(3*x^5)^3 = 0
(3*x^5)^3 = 0
27*x^15 = 0 // : 27
x^15 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/((3*x^5)^3) = 0
1/27*x^-15 = 0 // : 1/27
x^-15 = 0
x naleu017Cy do O
x belongs to the empty set
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