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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
v^2-((5*v)/v) = 0
v^2-5 = 0
1*v^2 = 5 // : 1
v^2 = 5
v^2 = 5 // ^ 1/2
abs(v) = 5^(1/2)
v = 5^(1/2) or v = -5^(1/2)
v in { 5^(1/2), -5^(1/2) }
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