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D( f )
8*f^10 = 0
8*f^10 = 0
8*f^10 = 0
8*f^10 = 0 // : 8
f^10 = 0
f = 0
f in (-oo:0) U (0:+oo)
(4*f*(f^4)^2)/(8*f^10) = 0
1/2*f^-1 = 0 // : 1/2
f^-1 = 0
f należy do O
f belongs to the empty set
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