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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
X^-6 = 1/64 // - 1/64
X^-6-(1/64) = 0
X^-6-1/64 = 0
1*X^-6 = 1/64 // : 1
X^-6 = 1/64
-6 < 0
1/(X^6) = 1/64 // * X^6
1 = 1/64*X^6 // : 1/64
64 = X^6
X^6 = 64 // ^ 1/6
abs(X) = 2
X = 2 or X = -2
X in { 2, -2 }
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