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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-2/n < -12 // + 12
12-2/n < 0
-2*n^-1 < -12
-2*n^-1 < -12 // * -1
2*n^-1 > 12
2*n^-1 > 12 // : 2
n^-1 > 12/2
n^-1 > 6
1/(n^1) > 6
n <> 0
1/(n^1) > 6 // * n^2
(n^2)/(n^1) > 6*n^2
n^1 > 6*n^2
n-6*n^2 > 0
n^1*(1-6*n) > 0
n < 0
-(abs(n))^1*(6*(abs(n))^1+1) > 0 // : -(abs(n))^1
6*(abs(n))^1+1 < 0
6*(abs(n))^1 < -1 // : 6
(abs(n))^1 < -1/6
(abs(n))^1 < -1/6 // ^ 1/1
abs(n) < (-1/6)^(1/1)
abs(n) < -1/6
n belongs to the empty set
n < 0
n > 0
n^1*(1-(6*n^1)) > 0 // : n^1
1-(6*n^1) > 0
1 > 6*n^1 // : 6
1/6 > n^1 // ^ 1/1
(1/6)^(1/1) > n
n in (0:1/6)
n > 0
n in (0:1/6)
n in (0:1/6)
(0:1/6)
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