how to prove if [math] cot \frac {\hat A}{2} = \frac {b+c} {a} [/math] , [ math] \Delta [/math] ABC is right angled? - Quora
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![Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]](https://trigidentities.net/wp-content/uploads/2020/06/Screenshot-2020-06-03-at-6.49.12-PM.png "Formula of Trigonometry - [Sin, Cos, Tan, Cot, Sec & Cosec]")
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