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D( x )
x^3-(4*x) = 0
x^3-(4*x) = 0
x^3-(4*x) = 0
x^3-4*x = 0
x^3-4*x = 0
x*(x^2-4) = 0
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x = 0
x = 0
x in (-oo:-2) U (-2:0) U (0:2) U (2:+oo)
(4*x^2-(5*x)-6)/(x^3-(4*x)) = 0
(4*x^2-5*x-6)/(x^3-4*x) = 0
4*x^2-5*x-6 = 0
4*x^2-5*x-6 = 0
DELTA = (-5)^2-(-6*4*4)
DELTA = 121
DELTA > 0
x = (121^(1/2)+5)/(2*4) or x = (5-121^(1/2))/(2*4)
x = 2 or x = -3/4
(x+3/4)*(x-2) = 0
x^3-4*x = 0
x*(x^2-4) = 0
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x*(x-2)*(x+2) = 0
((x+3/4)*(x-2))/(x*(x-2)*(x+2)) = 0
( x+3/4 )
x+3/4 = 0 // - 3/4
x = -3/4
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 2}
x = -3/4
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