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