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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
X^-2 = 1/6 // - 1/6
X^-2-(1/6) = 0
X^-2-1/6 = 0
1*X^-2 = 1/6 // : 1
X^-2 = 1/6
-2 < 0
1/(X^2) = 1/6 // * X^2
1 = 1/6*X^2 // : 1/6
6 = X^2
X^2 = 6 // ^ 1/2
abs(X) = 6^(1/2)
X = 6^(1/2) or X = -6^(1/2)
X in { 6^(1/2), -6^(1/2) }
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