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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
((18*n^-3)/(-72))*n^6 = 0
-1/4*n^3 = 0 // : -1/4
n^3 = 0
n = 0
n in { 0}
n belongs to the empty set
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