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