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