\triangle A B C, \text { prove that } \frac{b-\c}{a}=\frac{\tan \frac{ – InterviewSolution

1.	\triangle A B C, \text { prove that } \frac{b-\c}{a}=\frac{\tan \frac{B}{2}-\tan \frac{C}{2}}{\tan \frac{B}{2}+\tan \frac{C}{2}}
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