In a \( \triangle A B C \), if the diameter of the incircle is \( a+c-b \), then \( \angle B= \)...

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In a \( \triangle A B C \), if the diameter of the incircle is \( a+c-b \), then \( \angle B= \)
(A) \( \frac{\pi}{4} \)
(B) \( \frac{\pi}{3} \)
(C) \( \frac{\pi}{2} \)
(D) none of these
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