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D( x )
x^-2*y^3*z = 0
(x^-2*y^-2*z)^2 = 0
x = 0
x^-2*y^3*z = 0
x^-2*y^3*z = 0
x^-2*y^3*z = 0 // : y^3*z
x^-2 = 0
x należy do O
(x^-2*y^-2*z)^2 = 0
(x^-2*y^-2*z)^2 = 0
x^-4*y^-4*z^2 = 0 // : y^-4*z^2
x^-4 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-2*y^3*z)^-3)/((x^-2*y^-2*z)^2) = 0
x^10*y^-5*z^-5 = 0 // : y^-5*z^-5
x^10 = 0
x = 0
x in { 0}
x belongs to the empty set
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