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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3*3*3*3 = (6*6)/n // - (6*6)/n
3*3*3*3-((6*6)/n) = 0
3*3*3*3-36*n^-1 = 0
-36*n^-1 = -81 // : -36
n^-1 = 9/4
-1 < 0
1/(n^1) = 9/4 // * n^1
1 = 9/4*n^1 // : 9/4
4/9 = n^1
n = 4/9
n = 4/9
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