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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
r^-3*((r^-2)/2) = 0
1/2*r^-5 = 0 // : 1/2
r^-5 = 0
r naleu017Cy do O
r belongs to the empty set
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