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D( x )
8*x^12 = 0
8*x^12 = 0
8*x^12 = 0
8*x^12 = 0 // : 8
x^12 = 0
x = 0
x in (-oo:0) U (0:+oo)
((8*x^12)^-2)/3 = 0
1/192*x^-24 = 0 // : 1/192
x^-24 = 0
x należy do O
x belongs to the empty set
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