If \( \alpha \) and \( \beta \) are two different complex numbers with \( |\beta|=1 \), then \( ...

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If \( \alpha \) and \( \beta \) are two different complex numbers with \( |\beta|=1 \), then \( \left|\frac{\beta-\alpha}{1-\bar{\alpha} \beta}\right| \) is equal to
(a) 0
(b) \( \frac{1}{2} \)
(c) 1
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