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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
((1/4)/2)/15 = (5/3)/n // - (5/3)/n
((1/4)/2)/15-((5/3)/n) = 0
(-5/3)*n^-1+((1/4)/2)/15 = 0
-5/3*n^-1 = -1/120 // : -5/3
n^-1 = 1/200
-1 < 0
1/(n^1) = 1/200 // * n^1
1 = 1/200*n^1 // : 1/200
200 = n^1
n = 200
n = 200
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