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