Class 11MathematicsTrigonometrical EquationsRelation between sides and angles, Solutions of triangles
MediumIn a triangle $ABC$ with usual notations,find the value of $\cot \frac{A}{2} + \cot \frac{B}{2} + \cot \frac{C}{2}$.
- A$\frac{s^2}{\Delta}$,where $\Delta$ is the area of the triangle $ABC$.
- B$\frac{s}{\Delta}$,where $\Delta$ is the area of the triangle $ABC$.
- C$\frac{\Delta}{s}$,where $\Delta$ is the area of the triangle $ABC$.
- D$\Delta$,where $\Delta$ is the area of the triangle $ABC$.
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