Let $\alpha$ and $\beta$ be the real numbers such that $\lim _{x \rightarrow 0} \frac{1}{x^3}\left(\frac{\alpha}{2} \int_0^x \frac{1}{1-t^2} d t+\beta x \cos x\right)=2$
Then the value of $\alpha+\beta$ is $\_\_\_\_$ m
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