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D( x )
9*x^2*y = 0
x = 0
4*x^-2*y = 0
9*x^2*y = 0
9*x^2*y = 0
9*x^2*y = 0 // : 9*y
x^2 = 0
x = 0
x = 0
x = 0
4*x^-2*y = 0
4*x^-2*y = 0
4*x^-2*y = 0 // : 4*y
x^-2 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((3*x^5*y^-3)/(4*x^-2*y))*((8*x^-2*y^5)/(9*x^2*y)) = 0
2/3*x^3 = 0 // : 2/3
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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