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D( x )
y^9 = 0
(15*x^8)/(y^9) <= 0
y^9 = 0
y^9 = 0
y^9 = 0
x należy do R
(15*x^8)/(y^9) <= 0
(15*x^8)/(y^9) <= 0
(15*x^8)/(y^9) = 0
15*x^8*y^-9 = 0 // : 15*y^-9
x^8 = 0
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
x belongs to the empty set
ln((15*x^8)/(y^9)) = 0
x belongs to the empty set
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