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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
1.8/2000 = 1.3/v // - 1.3/v
1.8/2000-(1.3/v) = 0
1.8/2000-1.3*v^-1 = 0
-1.3*v^-1 = -0.0009 // : -1.3
v^-1 = 0.00069231
-1 < 0
1/(v^1) = 0.00069231 // * v^1
1 = 0.00069231*v^1 // : 0.00069231
1444.43962965 = v^1
v = 1444.43962965
v = 1444.43962965
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