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D( x )
81*x^8 = 0
81*x^8 = 0
81*x^8 = 0
81*x^8 = 0 // : 81
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
((81*x^8)^-3)/4 = 0
1/2125764*x^-24 = 0 // : 1/2125764
x^-24 = 0
x należy do O
x belongs to the empty set
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