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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-4 = 1/4096 // - 1/4096
x^-4-(1/4096) = 0
x^-4-1/4096 = 0
1*x^-4 = 1/4096 // : 1
x^-4 = 1/4096
-4 < 0
1/(x^4) = 1/4096 // * x^4
1 = 1/4096*x^4 // : 1/4096
4096 = x^4
x^4 = 4096 // ^ 1/4
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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