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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
48 = 4/v // - 4/v
48-(4/v) = 0
48-4*v^-1 = 0
-4*v^-1 = -48 // : -4
v^-1 = 12
-1 < 0
1/(v^1) = 12 // * v^1
1 = 12*v^1 // : 12
1/12 = v^1
v = 1/12
v = 1/12
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