Assume that $\underset{\theta \to -1}{lim} f\left(\theta \right)$exists and $\frac{{\theta }^2+\theta -2}{\theta +3}\le \frac{f\left(\theta \right)}{{\theta }^2}\le \frac{{\theta }^2+2\theta -1}{\theta +3}$holds for certain interval containing the point $\theta =-1$, then   $\underset{\theta \to -1}{lim} \frac{f\left(\theta \right)}{{\theta }^2}$ , is