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D( x )
(w^2*z^4)^3 = 0
-3*x^3*y^2 = 0
(w^2*z^4)^3 = 0
(w^2*z^4)^3 = 0
w^6*z^12 = 0
x naleu017Cy do R
-3*x^3*y^2 = 0
-3*x^3*y^2 = 0
-3*x^3*y^2 = 0 // : -3*y^2
x^3 = 0
x = 0
x belongs to the empty set
((-3*x^3*y^2)^-1)/((w^2*z^4)^3) = 0
x belongs to the empty set
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