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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
13/3 = 4/v // - 4/v
13/3-(4/v) = 0
13/3-4*v^-1 = 0
-4*v^-1 = -13/3 // : -4
v^-1 = 13/12
-1 < 0
1/(v^1) = 13/12 // * v^1
1 = 13/12*v^1 // : 13/12
12/13 = v^1
v = 12/13
v = 12/13
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