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D( s )
s^5 = 0
s^5 = 0
s^5 = 0
1*s^5 = 0 // : 1
s^5 = 0
s = 0
s in (-oo:0) U (0:+oo)
-(12/(s^5)) = 0
-12*s^-5 = 0 // : -12
s^-5 = 0
s należy do O
s belongs to the empty set
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