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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.25/2 = 0.5/x // - 0.5/x
0.25/2-(0.5/x) = 0
0.25/2-0.5*x^-1 = 0
-0.5*x^-1 = -0.125 // : -0.5
x^-1 = 0.25
-1 < 0
1/(x^1) = 0.25 // * x^1
1 = 0.25*x^1 // : 0.25
4 = x^1
x = 4
x = 4
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