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D( x )
x = 0
(x^-4)/5 = 0
x = 0
x = 0
(x^-4)/5 = 0
(x^-4)/5 = 0
1/5*x^-4 = 0 // : 1/5
x^-4 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(((x^2)/7)*((x^5)/2))/((x^-4)/5) = 0
5/14*x^11 = 0 // : 5/14
x^11 = 0
x = 0
x in { 0}
x belongs to the empty set
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