In-ABC-then-cos-A-2-cos-B-2-cos-C-2-1-sin-A-2-1-sin-B-2-1-sin-C-2-3-3-

Question Number 170115 by Shrinava last updated on 16/May/22

In △ ABC then :

\frac{\cos \frac{A}{2} \cdot \cos \frac{B}{2} \cdot \cos \frac{C}{2}}{(1 - \sin \frac{A}{2}) \cdot (1 - \sin \frac{B}{2}) \cdot (1 - \sin \frac{C}{2})} ⩾ 3 \sqrt{3}