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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2*((x^8)/(x^2)) = y // - y
x^2*((x^8)/(x^2))-y = 0
1*x^8 = y // : 1
x^8 = y
x^8 = y // ^ 1/8
abs(x) = y^(1/8)
x = y^(1/8) or x = -y^(1/8)
x in { y^(1/8), -y^(1/8) }
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