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D( x )
y^3 = 0
(4*x)/(y^3) <= 0
y^3 = 0
y^3 = 0
y^3 = 0
x należy do R
(4*x)/(y^3) <= 0
(4*x)/(y^3) <= 0
(4*x)/(y^3) = 0
4*x*y^-3 = 0 // : 4*y^-3
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
x belongs to the empty set
ln((4*x)/(y^3)) = 0
x belongs to the empty set
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