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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-5 = 1/9 // - 1/9
x^-5-(1/9) = 0
x^-5-1/9 = 0
1*x^-5 = 1/9 // : 1
x^-5 = 1/9
-5 < 0
1/(x^5) = 1/9 // * x^5
1 = 1/9*x^5 // : 1/9
9 = x^5
x^5 = 9 // ^ 1/5
x = 9^(1/5)
x = 9^(1/5)
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