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D( x )
x-3 <= 0
4*x^3 = 0
x-3 <= 0
x-3 <= 0
x-3 <= 0 // + 3
x <= 3
4*x^3 = 0
4*x^3 = 0
4*x^3 = 0 // : 4
x^3 = 0
x = 0
x in (3:+oo)
(2*ln(x-3))/(4*x^3) = 0
(2*ln(x-3))/(4*x^3) = 0 // * 4*x^3
2*ln(x-3) = 0
2*ln(x-3) = 0 // : 2
ln(x-3) = 0
ln(x-3) = ln(e^0)
x-3 = e^0
x-e^0-3 = 0
x-4 = 0 // + 4
x = 4
x = 4
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