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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
(1.9/r)/0.3 = 0
6.33333333*r^-1 = 0 // : 6.33333333
r^-1 = 0
r należy do O
r belongs to the empty set
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