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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
9/1 = 33.8/v // - 33.8/v
9/1-(33.8/v) = 0
9-33.8*v^-1 = 0
-33.8*v^-1 = -9 // : -33.8
v^-1 = 0.26627219
-1 < 0
1/(v^1) = 0.26627219 // * v^1
1 = 0.26627219*v^1 // : 0.26627219
3.75555555 = v^1
v = 3.75555555
v = 3.75555555
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