If \( a\left(x^{2}+y^{2}+2 y+1\right)=(x-2 y+3)^{2} \) is an ellipse
and \( a \in(b, \infty) \) ....
If \( a\left(x^{2}+y^{2}+2 y+1\right)=(x-2 y+3)^{2} \) is an ellipse
\( \mathrm{P} \)
and \( a \in(b, \infty) \) then the value of ' \( b \) ' is
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