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D( u )
u^2 = 0
u^2 = 0
u^2 = 0
1*u^2 = 0 // : 1
u^2 = 0
u = 0
u in (-oo:0) U (0:+oo)
(-3/(u^2))^3 = 0
-27*u^-6 = 0 // : -27
u^-6 = 0
u należy do O
u belongs to the empty set
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