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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
62.4 = 12300/v // - 12300/v
62.4-(12300/v) = 0
62.4-12300*v^-1 = 0
-12300*v^-1 = -62.4 // : -12300
v^-1 = 0.00507317
-1 < 0
1/(v^1) = 0.00507317 // * v^1
1 = 0.00507317*v^1 // : 0.00507317
197.11541305 = v^1
v = 197.11541305
v = 197.11541305
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