![In triangle ABC , prove that tan (B-C)/2 =[( b-c) /(b+c )] cot A/2 ...](https://i.ytimg.com/vi/3_82bgptcj4/maxresdefault.jpg?sqp=-oaymwEmCIAKENAF8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGHIgQig-MA8=&rs=AOn4CLBflUUb1sQ4pq3f1JYivFYOPNTRxg)
![Prove: |[a-b-c,2a,2a],[2b,b-c-a,2b],[2c,2c,c-a-b]|=(a+b+c)^3](https://static.doubtnut.com/ss/web/6558289.webp)
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