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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
43 = 1.5/r // - 1.5/r
43-(1.5/r) = 0
43-1.5*r^-1 = 0
-1.5*r^-1 = -43 // : -1.5
r^-1 = 28.66666667
-1 < 0
1/(r^1) = 28.66666667 // * r^1
1 = 28.66666667*r^1 // : 28.66666667
0.03488372 = r^1
r = 0.03488372
r = 0.03488372
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