Class 11MathematicsTrigonometrical EquationsRelation between sides and angles, Solutions of triangles
MediumIn a triangle $ABC$ with usual notations,if $\tan \left(\frac{B-C}{2}\right) = x \cot \frac{A}{2}$,then $x =$
- A$\frac{c-a}{c+a}$
- B$\frac{a-b}{a+b}$
- C$\frac{b-c}{b+c}$
- D$\frac{a+b}{a-b}$
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