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D( x )
4*x^2-8 = 0
4*x^2-8 = 0
4*x^2-8 = 0
4*x^2 = 8 // : 4
x^2 = 2
x^2 = 2 // ^ 1/2
abs(x) = 2^(1/2)
x = 2^(1/2) or x = -2^(1/2)
x in (-oo:-2^(1/2)) U (-2^(1/2):2^(1/2)) U (2^(1/2):+oo)
(x^3)/(4*x^2-8) = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x = 0
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