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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3 = 9/v // - 9/v
3-(9/v) = 0
3-9*v^-1 = 0
-9*v^-1 = -3 // : -9
v^-1 = 1/3
-1 < 0
1/(v^1) = 1/3 // * v^1
1 = 1/3*v^1 // : 1/3
3 = v^1
v = 3
v = 3
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