मान लीजिए $f(x)=\int_0^x g(t) \log _e\left(\frac{1-t}{1+t}\right) d t$,जहाँ $g$ एक सतत विषम फलन है। यदि $\int_{-\pi / 2}^{\pi / 2}\left(f(x)+\frac{x^2 \cos x}{1+e^x}\right) d x=\left(\frac{\pi}{\alpha}\right)^2-\alpha$ है,तो $\alpha$ का मान ............. है।

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