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D( x )
(3*x)/(y^2) <= 0
y^2 = 0
(3*x)/(y^2) <= 0
(3*x)/(y^2) <= 0
(3*x)/(y^2) = 0
3*x*y^-2 = 0 // : 3*y^-2
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
y^2 = 0
y^2 = 0
y^2 = 0
x należy do R
x belongs to the empty set
log(6)((3*x)/(y^2)) = 0
x belongs to the empty set
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