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D( x )
(((x^1)/4)*z^4)/5 = 0
(((x^1)/4)*z^4)/5 = 0
(((x^1)/4)*z^4)/5 = 0
((x/4)*z^4)/5 = 0
1/20*x*z^4 = 0 // : 1/20*z^4
x = 0
x in (-oo:0) U (0:+oo)
((((x^1)/4)*z^4)/5)^-2 = 0
(((x/4)*z^4)/5)^-2 = 0
400*x^-2*z^-8 = 0 // : 400*z^-8
x^-2 = 0
x należy do O
x belongs to the empty set
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