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