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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-6 = 3/4 // - 3/4
x^-6-(3/4) = 0
x^-6-3/4 = 0
1*x^-6 = 3/4 // : 1
x^-6 = 3/4
-6 < 0
1/(x^6) = 3/4 // * x^6
1 = 3/4*x^6 // : 3/4
4/3 = x^6
x^6 = 4/3 // ^ 1/6
abs(x) = (4/3)^(1/6)
x = (4/3)^(1/6) or x = -(4/3)^(1/6)
x in { (4/3)^(1/6), -(4/3)^(1/6) }
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