In a \( \triangle A B C, \sum(b+c) \tan \frac{A}{2} \tan \left(\frac{B-C}{2}\right)= \) (A) \( a...

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In a \( \triangle A B C, \sum(b+c) \tan \frac{A}{2} \tan \left(\frac{B-C}{2}\right)= \)
(A) \( a \)
(B) \( b \)
(C) \( \mathcal{C} \)
(D) undefined
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