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D( X )
2*X = 0
2*X = 0
2*X = 0
2*X = 0 // : 2
X = 0
X in (-oo:0) U (0:+oo)
(X^2-2)/(2*X) = 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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