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D( x )
18*x^3*y^2 = 0
18*x^3*y^2 = 0
18*x^3*y^2 = 0
18*x^3*y^2 = 0 // : 18*y^2
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x^2*y^4)/(18*x^3*y^2) = 0
1/6*x^-1*y^2 = 0 // : 1/6*y^2
x^-1 = 0
x należy do O
x belongs to the empty set
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