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D( x )
(x^2)/5 = 0
(x^2)/5 = 0
(x^2)/5 = 0
1/5*x^2 = 0 // : 1/5
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^2)/5)^-3)/4 = 0
125/4*x^-6 = 0 // : 125/4
x^-6 = 0
x należy do O
x belongs to the empty set
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