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D( x )
x^4 = 0
(x^5)/(x^4) <= 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
(x^5)/(x^4) <= 0
(x^5)/(x^4) <= 0
x+0 <= 0 // - 0
x <= 0
x in (0:+oo)
ln((x^5)/(x^4)) = 0
ln((x^5)/(x^4)) = ln(e^0)
(x^5)/(x^4) = e^0
(x^5)/(x^4)-e^0 = 0
x-1 = 0 // + 1
x = 1
x = 1
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