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D( x )
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(4*x^3-(5*x))/(2*x-1) = 0
(4*x^3-5*x)/(2*x-1) = 0
4*x^3-5*x = 0
x*(4*x^2-5) = 0
4*x^2 = 5 // : 4
x^2 = 5/4
x^2 = 5/4 // ^ 1/2
abs(x) = (5/4)^(1/2)
x = (5/4)^(1/2) or x = -(5/4)^(1/2)
x*(x-(5/4)^(1/2))*(x+(5/4)^(1/2)) = 0
(x*(x-(5/4)^(1/2))*(x+(5/4)^(1/2)))/(2*x-1) = 0
( x+(5/4)^(1/2) )
x+(5/4)^(1/2) = 0 // - (5/4)^(1/2)
x = -(5/4)^(1/2)
( x-(5/4)^(1/2) )
x-(5/4)^(1/2) = 0 // + (5/4)^(1/2)
x = (5/4)^(1/2)
( x )
x = 0
x in { -(5/4)^(1/2), (5/4)^(1/2), 0 }
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