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D( x )
(x^5*((z^1)/2))/4 = 0
(x^5*((z^1)/2))/4 = 0
(x^5*((z^1)/2))/4 = 0
(x^5*(z/2))/4 = 0
1/8*x^5*z = 0 // : 1/8*z
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^5*((z^1)/2))/4)^-2 = 0
((x^5*(z/2))/4)^-2 = 0
64*x^-10*z^-2 = 0 // : 64*z^-2
x^-10 = 0
x należy do O
x belongs to the empty set
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