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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(X^-5)/4 = 2 // - 2
(X^-5)/4-2 = 0
1/4*X^-5 = 2 // : 1/4
X^-5 = 8
-5 < 0
1/(X^5) = 8 // * X^5
1 = 8*X^5 // : 8
1/8 = X^5
X^5 = 1/8 // ^ 1/5
X = (1/8)^(1/5)
X = (1/8)^(1/5)
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