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D( r )
16*r^3 = 0
16*r^3 = 0
16*r^3 = 0
16*r^3 = 0 // : 16
r^3 = 0
r = 0
r in (-oo:0) U (0:+oo)
(16*r^2)/(16*r^3) = 0
1*r^-1 = 0 // : 1
r^-1 = 0
r naleu017Cy do O
r belongs to the empty set
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