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