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D( x )
x = 0
(z^0*x^-4*y^9)/(x^12*y^-3) = 0
x^12*y^-3 = 0
x = 0
x = 0
(z^0*x^-4*y^9)/(x^12*y^-3) = 0
(z^0*x^-4*y^9)/(x^12*y^-3) = 0
(x^-4*y^9)/(x^12*y^-3) = 0
x^-16*y^12 = 0 // : y^12
x^-16 = 0
x należy do O
x^12*y^-3 = 0
x^12*y^-3 = 0
x^12*y^-3 = 0 // : y^-3
x^12 = 0
x = 0
x in (-oo:0) U (0:+oo)
((z^0*x^-4*y^9)/(x^12*y^-3))^-3 = 0
((x^-4*y^9)/(x^12*y^-3))^-3 = 0
x^48*y^-36 = 0 // : y^-36
x^48 = 0
x = 0
x in { 0}
x belongs to the empty set
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