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D( X )
2*X^6 = 0
2*X^6 = 0
2*X^6 = 0
2*X^6 = 0 // : 2
X^6 = 0
X = 0
X in (-oo:0) U (0:+oo)
(5*X^8)/(2*X^6) = 1000 // - 1000
(5*X^8)/(2*X^6)-1000 = 0
5/2*X^2 = 1000 // : 5/2
X^2 = 400
X^2 = 400 // ^ 1/2
abs(X) = 20
X = 20 or X = -20
X in { 20, -20 }
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