Obtain the maximum and minimum values of the expression \( \frac{x^{2}-2 x \cos \alpha+1}{x^{2}-...

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Obtain the maximum and minimum values of the expression \( \frac{x^{2}-2 x \cos \alpha+1}{x^{2}-2 x \cos \beta+1}, x \in R \) and \( 0\alpha, \beta\pi / 2 \)
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