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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
((-10/9)*X^-4)/3-(((20/9)*X^-1)/3) = 0
(-20/27)*X^-1+((-10/9)*X^-4)/3 = 0
-20/27*X^-1-10/27*X^-4 = 0
t_1 = X^-1
-10/27*t_1^4-20/27*t_1^1 = 0
-10/27*t_1^4-20/27*t_1 = 0
-10/27*t_1*(t_1^3+2) = 0
1*t_1^3 = -2 // : 1
t_1^3 = -2
t_1^3 = -2 // ^ 1/3
t_1 = -2^(1/3)
(-10*t_1)/27 = 0
-10/27*t_1 = 0 // : -10/27
t_1 = 0
t_1 = -2^(1/3)
X^-1+2^(1/3) = 0
1*X^-1 = -2^(1/3) // : 1
X^-1 = -2^(1/3)
-1 < 0
1/(X^1) = -2^(1/3) // * X^1
1 = -2^(1/3)*X^1 // : -2^(1/3)
1/(-2^(1/3)) = X^1
X = 1/(-2^(1/3))
t_1 = 0
X^-1+0 = 0
X^-1 = 0
1*X^-1 = 0 // : 1
X^-1 = 0
X należy do O
X = 1/(-2^(1/3))
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