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