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