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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(x^4-64)/(x-2) = 0
1*x^4 = 64 // : 1
x^4 = 64
x^4 = 64 // ^ 1/4
abs(x) = 2*4^(1/4)
x = 2*4^(1/4) or x = -(2*4^(1/4))
x in { 2*4^(1/4), -(2*4^(1/4)) }
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