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D( x )
x <= 0
x <= 0
x in (0:+oo)
x*((5*ln(x))/4) = 0
x = 0
(5*ln(x))/4 = 0
5/4*ln(x) = 0 // : 5/4
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
x*((5*ln(x))/4) = 0 <=> x = 0 or x*((5*ln(x))/4) = 0 <=> (5*ln(x))/4 = 0
x in { 0}
x = 1
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