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D( x )
9*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 in (-oo:0) U (0:+oo)
(12*x^2)/(9*x^2*y) = 0
4/3*y^-1 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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