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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+1/4 = (11/4)*x // - (11/4)*x
2/x-((11/4)*x)+1/4 = 0
(-11/4)*x+2/x+1/4 = 0
2*x^-1-11/4*x^1+1/4*x^0 = 0
(1/4*x^1-11/4*x^2+2*x^0)/(x^1) = 0 // * x^2
x^1*(1/4*x^1-11/4*x^2+2*x^0) = 0
x^1
(-11/4)*x^2+(1/4)*x+2 = 0
(-11/4)*x^2+(1/4)*x+2 = 0
DELTA = (1/4)^2-(2*4*(-11/4))
DELTA = 353/16
DELTA > 0
x = ((353/16)^(1/2)-(1/4))/(2*(-11/4)) or x = (-(1/4)-(353/16)^(1/2))/(2*(-11/4))
x = -2/11*((353/16)^(1/2)-1/4) or x = 2/11*((353/16)^(1/2)+1/4)
x in { -2/11*((353/16)^(1/2)-1/4), 2/11*((353/16)^(1/2)+1/4)}
x in { -2/11*((353/16)^(1/2)-1/4), 2/11*((353/16)^(1/2)+1/4) }
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