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D( x )
y^3 = 0
x*((4*x^3)/3)*y^5 = 0
y^3 = 0
y^3 = 0
y^3 = 0
x należy do R
x*((4*x^3)/3)*y^5 = 0
x*((4*x^3)/3)*y^5 = 0
4/3*x^4*y^5 = 0 // : 4/3*y^5
x^4 = 0
x = 0
x belongs to the empty set
((12*x)/(y^3))/(x*((4*x^3)/3)*y^5) = 0
x belongs to the empty set
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