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D( x )
x^3 = 0
x^6 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x^6 = 0
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/(x^6)-(9/(x^3))+8 = 0
1/(x^6)-9*x^-3+8 = 0
x^-6-9*x^-3+8 = 0
t_1 = x^-3
1*t_1^2-9*t_1^1+8 = 0
t_1^2-9*t_1+8 = 0
DELTA = (-9)^2-(1*4*8)
DELTA = 49
DELTA > 0
t_1 = (49^(1/2)+9)/(1*2) or t_1 = (9-49^(1/2))/(1*2)
t_1 = 8 or t_1 = 1
t_1 = 1
x^-3-1 = 0
1*x^-3 = 1 // : 1
x^-3 = 1
-3 < 0
1/(x^3) = 1 // * x^3
1 = 1*x^3 // : 1
1 = x^3
x^3 = 1 // ^ 1/3
x = 1
t_1 = 8
x^-3-8 = 0
1*x^-3 = 8 // : 1
x^-3 = 8
-3 < 0
1/(x^3) = 8 // * x^3
1 = 8*x^3 // : 8
1/8 = x^3
x^3 = 1/8 // ^ 1/3
x = 1/2
x in { 1, 1/2 }
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