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D( x )
((3*x^2*y)/2)*y = 0
((3*x^2*y)/2)*y = 0
((3*x^2*y)/2)*y = 0
3/2*x^2*y^2 = 0 // : 3/2*y^2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((3*x^2*y)/2)*y)^-3 = 0
8/27*x^-6*y^-6 = 0 // : 8/27*y^-6
x^-6 = 0
x należy do O
x belongs to the empty set
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