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D( x )
y^2 = 0
x^2 = 0
y^2 = 0
y^2 = 0
y^2 = 0
x należy do R
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x belongs to the empty set
((3*x^2)/(y^2))*((6*y^3)/(x^2)) = 0
x belongs to the empty set
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