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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^4)/x = 2 // - 2
(x^4)/x-2 = 0
1*x^3 = 2 // : 1
x^3 = 2
x^3 = 2 // ^ 1/3
x = 2^(1/3)
x = 2^(1/3)
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