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