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D( x )
y^-4*((4*x^2*z^-2)/12) = 0
y^-4*((4*x^2*z^-2)/12) = 0
y^-4*((4*x^2*z^-2)/12) = 0
1/3*x^2*y^-4*z^-2 = 0 // : 1/3*y^-4*z^-2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(y^-4*((4*x^2*z^-2)/12))^-3 = 0
27*x^-6*y^12*z^6 = 0 // : 27*y^12*z^6
x^-6 = 0
x należy do O
x belongs to the empty set
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