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D( r )
r = 0
8*r^-6 = 0
r = 0
r = 0
8*r^-6 = 0
8*r^-6 = 0
8*r^-6 = 0 // : 8
r^-6 = 0
r należy do O
r in (-oo:0) U (0:+oo)
(36*r^-15)/(8*r^-6) = 0
9/2*r^-9 = 0 // : 9/2
r^-9 = 0
r należy do O
r belongs to the empty set
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