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D( x )
8*y^3 = 0
x = 0
8*y^3 = 0
8*y^3 = 0
8*y^3 = 0
x należy do R
x = 0
x = 0
x belongs to the empty set
5*((4*(4*x^-1)^2*x^2)/(8*y^3))*y^-2 = 0
x belongs to the empty set
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