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D( x )
4*x <= 0
4*x <= 0
4*x <= 0
4*x+0 <= 0 // - 0
4*x <= 0 // : 4
x <= 0/4
x <= 0
x in (0:+oo)
(ln(4*x))^(1/3) = 0
t_1 = ln(4*x)
1*t_1^(1/3) = 0 // : 1
t_1^(1/3) = 0
t_1 = 0
ln(4*x) = 0
ln(4*x) = ln(e^0)
4*x = e^0
4*x-e^0 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x = 1/4
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