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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
2/9.4 = 0.5/v // - 0.5/v
2/9.4-(0.5/v) = 0
2/9.4-0.5*v^-1 = 0
-0.5*v^-1 = -0.21276596 // : -0.5
v^-1 = 0.42553192
-1 < 0
1/(v^1) = 0.42553192 // * v^1
1 = 0.42553192*v^1 // : 0.42553192
2.34999997 = v^1
v = 2.34999997
v = 2.34999997
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