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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
v-(10/v) = 5/11 // - 5/11
v-(10/v)-(5/11) = 0
v-10*v^-1-5/11 = 0
1*v^1-10*v^-1-5/11*v^0 = 0
(1*v^2-5/11*v^1-10*v^0)/(v^1) = 0 // * v^2
v^1*(1*v^2-5/11*v^1-10*v^0) = 0
v^1
v^2+(-5/11)*v-10 = 0
v^2+(-5/11)*v-10 = 0
DELTA = (-5/11)^2-(-10*1*4)
DELTA = 4865/121
DELTA > 0
v = ((4865/121)^(1/2)-(-5/11))/(1*2) or v = (-(-5/11)-(4865/121)^(1/2))/(1*2)
v = ((4865/121)^(1/2)+5/11)/2 or v = (5/11-(4865/121)^(1/2))/2
v in { (5/11-(4865/121)^(1/2))/2, ((4865/121)^(1/2)+5/11)/2}
v in { (5/11-(4865/121)^(1/2))/2, ((4865/121)^(1/2)+5/11)/2 }
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