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If the equation (x/(1+x^2))^2+a(x/(1+x^2...

If the equation `(x/(1+x^2))^2+a(x/(1+x^2))+3=0` has exactly two real roots which are distinct, then the set of possible real values of `a` is `((-13)/2,0)` (b) `(oo,-(13)/2)` `((-13)/2,(13)/2)` (d) `((13)/2,oo)`

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