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D( x )
x^2-4 <= 0
x^2-4 <= 0
x^2-4 <= 0
1*x^2 <= 4
1*x^2 <= 4 // : 1
x^2 <= 4/1
x^2 <= 4
x^2 <= 4 // ^ 1/2
abs(x) <= 2
x in <-2:2>
x in (-oo:-2) U (2:+oo)
-ln(x^2-4)/2 = 0
1/2*(-ln(x^2-4)) = 0 // : 1/2
-ln(x^2-4) = 0
-ln(x^2-4) = 0 // * -1
ln(x^2-4) = ln(e^0)
x^2-4 = e^0
x^2-e^0-4 = 0
1*x^2 = 5 // : 1
x^2 = 5
x^2 = 5 // ^ 1/2
abs(x) = 5^(1/2)
x = 5^(1/2) or x = -5^(1/2)
x in { 5^(1/2), -5^(1/2) }
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