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