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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 0.002 // - 0.002
3/n-0.002 = 0
3*n^-1 = 0.002 // : 3
n^-1 = 0.00066667
-1 < 0
1/(n^1) = 0.00066667 // * n^1
1 = 0.00066667*n^1 // : 0.00066667
1499.99250004 = n^1
n = 1499.99250004
n = 1499.99250004
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