Class 11MathematicsTrigonometrical EquationsRelation between sides and angles, Solutions of triangles
EasyLet $p, q$ and $r$ be the sides opposite to the angles $P, Q$ and $R$ respectively in a $\Delta PQR$. Then, $2pr \sin \left(\frac{P-Q+R}{2}\right)$ equals
- A$p^{2}+q^{2}+r^{2}$
- B$p^{2}+r^{2}-q^{2}$
- C$q^{2}+r^{2}-p^{2}$
- D$p^{2}+q^{2}-r^{2}$
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