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