Class 11MathematicsTrigonometrical EquationsRelation between sides and angles, Solutions of triangles
EasyIn a $\triangle ABC$,if $a=4, b=5$ and $c=7$,then $\sin \left(\frac{A}{2}\right) = $
- A$\sqrt{\frac{3}{35}}$
- B$\sqrt{\frac{35}{3}}$
- C$\sqrt{\frac{2}{35}}$
- D$\sqrt{\frac{1}{35}}$
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