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D( x )
x = 0
(1/2)*x+1/4 = 0
x = 0
x = 0
(1/2)*x+1/4 = 0
(1/2)*x+1/4 = 0
1/2*x+1/4 = 0 // - 1/4
1/2*x = -1/4 // : 1/2
x = -1/4/1/2
x = -1/2
x in (-oo:-1/2) U (-1/2:0) U (0:+oo)
(x/4-(1/x))/((1/2)*x+1/4) = 0
(x/4-x^-1)/((1/2)*x+1/4) = 0
(1/4*x-x^-1)/(1/2*x+1/4) = 0
1/4*x-x^-1 = 0
x^-1*(1/4*x^2-1) = 0
1/4*x^2 = 1 // : 1/4
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x^-1*(x-2)*(x+2) = 0
(x^-1*(x-2)*(x+2))/(1/2*x+1/4) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-2 )
x-2 = 0 // + 2
x = 2
( x^-1 )
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x in { -2, 2 }
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