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D( r )
r = 0
r^3 = 0
7*(r^-2)^5 = 0
r = 0
r = 0
r^3 = 0
r^3 = 0
1*r^3 = 0 // : 1
r^3 = 0
r = 0
7*(r^-2)^5 = 0
7*(r^-2)^5 = 0
7*r^-10 = 0 // : 7
r^-10 = 0
r należy do O
r in (-oo:0) U (0:+oo)
(18*(r^3)^-2*r^4)/(7*(r^-2)^5) = 0
18/7*r^8 = 0 // : 18/7
r^8 = 0
r = 0
r in { 0}
r belongs to the empty set
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