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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-0.5875/n = -0.25 // + 0.25
0.25-0.5875/n = 0
-0.5875*n^-1 = -0.25 // : -0.5875
n^-1 = 0.42553191
-1 < 0
1/(n^1) = 0.42553191 // * n^1
1 = 0.42553191*n^1 // : 0.42553191
2.35000003 = n^1
n = 2.35000003
n = 2.35000003
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