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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
169.92/r = 48 // - 48
169.92/r-48 = 0
169.92*r^-1 = 48 // : 169.92
r^-1 = 0.28248588
-1 < 0
1/(r^1) = 0.28248588 // * r^1
1 = 0.28248588*r^1 // : 0.28248588
3.53999995 = r^1
r = 3.53999995
r = 3.53999995
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