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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x*((3*x^2*((3*x-3)/x))/6)-6 = 0
(3*x*x^2*(3*x-3))/(6*x)-6 = 0
(3*x*x^2*(3*x-3))/(6*x)+(-6*6*x)/(6*x) = 0
3*x*x^2*(3*x-3)-6*6*x = 0
9*x^4-9*x^3-36*x = 0
9*x^4-9*x^3-36*x = 0
9*x*(x^3-x^2-4) = 0
x^3-x^2-4 = 0
{ 1, -1, 2, -2, 4, -4 }
1
x = 1
x^3-x^2-4 = -4
1
-1
x = -1
x^3-x^2-4 = -6
-1
2
x = 2
x^3-x^2-4 = 0
2
x-2
x^2+x+2
x^3-x^2-4
x-2
2*x^2-x^3
x^2-4
2*x-x^2
2*x-4
4-2*x
0
x^2+x+2 = 0
DELTA = 1^2-(1*2*4)
DELTA = -7
DELTA < 0
x in { 2}
9*x*(x-2) = 0
(9*x*(x-2))/(6*x) = 0
(9*x*(x-2))/(6*x) = 0 // * 6*x
9*x*(x-2) = 0
( 9*x )
9*x = 0 // : 9
x = 0
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 0}
x = 2
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