Class 11MathematicsTrigonometrical EquationsRelation between sides and angles, Solutions of triangles
MediumIn $\triangle ABC$,with usual notations,$2ab \sin \frac{1}{2}(A+B-C) =$
- A$a^2-b^2-c^2$
- B$a^2+b^2-c^2$
- C$a^2+b^2+c^2$
- D$a^2-b^2+c^2$
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