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D( x )
-8*x^6 = 0
-8*x^6 = 0
-8*x^6 = 0
-8*x^6 = 0 // : -8
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
((-8*x^6)^-4)/3 = 0
1/12288*x^-24 = 0 // : 1/12288
x^-24 = 0
x należy do O
x belongs to the empty set
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