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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
2/r = 11/1 // - 11/1
2/r-(11/1) = 0
2/r-11 = 0
2*r^-1 = 11 // : 2
r^-1 = 11/2
-1 < 0
1/(r^1) = 11/2 // * r^1
1 = 11/2*r^1 // : 11/2
2/11 = r^1
r = 2/11
r = 2/11
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