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D( r )
r = 0
r^-5 = 0
2^3*(r^-5)^-3 = 0
r = 0
r = 0
r^-5 = 0
r^-5 = 0
1*r^-5 = 0 // : 1
r^-5 = 0
r należy do O
2^3*(r^-5)^-3 = 0
2^3*(r^-5)^-3 = 0
8*r^15 = 0 // : 8
r^15 = 0
r = 0
r in (-oo:0) U (0:+oo)
(6^-2*r^-3)/(2^3*(r^-5)^-3) = 0
1/288*r^-18 = 0 // : 1/288
r^-18 = 0
r należy do O
r belongs to the empty set
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