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D( x )
64*x^6 = 0
64*x^6 = 0
64*x^6 = 0
64*x^6 = 0 // : 64
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
((64*x^6)^-1)/2 = 0
1/128*x^-6 = 0 // : 1/128
x^-6 = 0
x należy do O
x belongs to the empty set
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