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