![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)
![Self energy of the 2B-string in the scaling interval a ∈ [1.5, 6.0] × ...](https://www.researchgate.net/publication/274174975/figure/fig3/AS:667718034415627@1536207793423/Self-energy-of-the-2B-string-in-the-scaling-interval-a-15-60-10-4.png)
![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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