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