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D( x )
4*x^2-9 = 0
4*x^2-9 = 0
4*x^2-9 = 0
4*x^2 = 9 // : 4
x^2 = 9/4
x^2 = 9/4 // ^ 1/2
abs(x) = 3/2
x = 3/2 or x = -3/2
x in (-oo:-3/2) U (-3/2:3/2) U (3/2:+oo)
(4*x^2-6)/(4*x^2-9) = 0
4*x^2 = 6 // : 4
x^2 = 3/2
x^2 = 3/2 // ^ 1/2
abs(x) = (3/2)^(1/2)
x = (3/2)^(1/2) or x = -(3/2)^(1/2)
x in { (3/2)^(1/2), -(3/2)^(1/2) }
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