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D( X )
X^4 = 0
X^4 = 0
X^4 = 0
1*X^4 = 0 // : 1
X^4 = 0
X = 0
X in (-oo:0) U (0:+oo)
X^2-(11/(X^4)) = 0
X^2-11*X^-4 = 0
t_1 = X^2
1*t_1^1-11*t_1^-2 = 0
t_1-11*t_1^-2 = 0
t_1*(1-11*t_1^-3) = 0
-11*t_1^-3 = -1 // : -11
t_1^-3 = 1/11
-3 < 0
1/(t_1^3) = 1/11 // * t_1^3
1 = 1/11*t_1^3 // : 1/11
11 = t_1^3
t_1^3 = 11 // ^ 1/3
t_1 = 11^(1/3)
t_1 = 0
t_1 = 0
t_1 = 11^(1/3)
X^2-11^(1/3) = 0
1*X^2 = 11^(1/3) // : 1
X^2 = 11^(1/3)
X^2 = 11^(1/3) // ^ 1/2
abs(X) = 11^(1/6)
X = 11^(1/6) or X = -11^(1/6)
t_1 = 0
X^2+0 = 0
X^2 = 0
1*X^2 = 0 // : 1
X^2 = 0
X = 0
X in { 0}
X in { 11^(1/6), -11^(1/6) }
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