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D( x )
4*z^4 = 0
-15*y^2 = 0
4*z^4 = 0
4*z^4 = 0
4*z^4 = 0
x należy do R
-15*y^2 = 0
-15*y^2 = 0
-15*y^2 = 0
x należy do R
x belongs to the empty set
((12*x^2*y)/(4*z^4))*((-25*x^2*z^3)/(-15*y^2)) = 0
x belongs to the empty set
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