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D( x )
(2*x^9)/(y^8) <= 0
y^8 = 0
(2*x^9)/(y^8) <= 0
(2*x^9)/(y^8) <= 0
(2*x^9)/(y^8) = 0
2*x^9*y^-8 = 0 // : 2*y^-8
x^9 = 0
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
y^8 = 0
y^8 = 0
y^8 = 0
x należy do R
x belongs to the empty set
ln((2*x^9)/(y^8)) = 0
x belongs to the empty set
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