Evaluate \( \int_{0}^{1} \frac{d x}{x^{2}+2 x \cos \alpha+1} \) where \( -\pi\alpha\pi \)

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Evaluate \( \int_{0}^{1} \frac{d x}{x^{2}+2 x \cos \alpha+1} \) where \( -\pi\alpha\pi \)
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