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यदि फलन $f(x)=\left\{\begin{array}{cc}\frac{x^2-2 x-3}{x+1}, & : x \neq 1 \\ \lambda & : x=-1\end{array}\right.$ बिन्दु $x=-1$ पर संतत है तो $\lambda$ का मान ज्ञात कीजिये।