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D( x )
x^2+1 = 0
x^2+1 = 0
x^2+1 = 0
1*x^2 = -1 // : 1
x^2 = -1
x in (-oo:+oo)
(X^5-(3*x^3))/(x^2+1) = 0
(X^5-3*x^3)/(x^2+1) = 0
-3*x^3 = -X^5 // : -3
x^3 = (X^5)/3
x^3 = (X^5)/3 // ^ 1/3
x = (X^(5/3))/(3^(1/3))
x = (X^(5/3))/(3^(1/3))
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