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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
1.2 = 0.6/v // - 0.6/v
1.2-(0.6/v) = 0
1.2-0.6*v^-1 = 0
-0.6*v^-1 = -1.2 // : -0.6
v^-1 = 2
-1 < 0
1/(v^1) = 2 // * v^1
1 = 2*v^1 // : 2
1/2 = v^1
v = 1/2
v = 1/2
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