sinA+sinB+sinC=4cos1/2Acos1/2Bcos1/2C
..guys can you help me in proving this one..tnx..
Yikes this is hard to read, some brackets or spaces would be nice ><
Is it $\displaystyle \displaystyle \begin{align*} \sin{(A)} + \sin{(B)} + \sin{(C)} = 4\cos{\left( \frac{A}{2} \right)} \cos{\left( \frac{B}{2}\right)}\cos{\left( \frac{C}{2}\right)} \end{align*}$?