In any triangle ABC ,${{\sin }^{2}}\frac{A}{2}+{{\sin }^{2}}\frac{B}{2}+{{\sin }^{2}}\frac{C}{2}$ is equal to

Question

Accepted Answer

$1-2\,\sin \frac{A}{2}\sin \frac{B}{2}\sin \frac{C}{2}$

Answer

$1-2\,\cos \frac{A}{2}\cos \frac{B}{2}\cos \frac{C}{2}$

Answer

$1-2\,\sin \frac{A}{2}\cos \frac{B}{2}\cos \frac{C}{2}$

Answer

$1-2\,\cos \frac{A}{2}\cos \frac{B}{2}\sin \frac{C}{2}$

trigonometry