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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4*n-((2*n-1)/n) = 0
(-1*(2*n-1))/n+4*n = 0
(-1*(2*n-1))/n+(4*n*n)/n = 0
4*n*n-1*(2*n-1) = 0
4*n^2-2*n+1 = 0
4*n^2-2*n+1 = 0
4*n^2-2*n+1 = 0
DELTA = (-2)^2-(1*4*4)
DELTA = -12
DELTA < 0
1 = 0
1/n = 0
1/n = 0 // * n
1 = 0
1 = 0
n belongs to the empty set
n belongs to the empty set
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