In a triangle PQR, Ð R = 2 p . If tan 2 æ ö P ç ÷ è ø and – tan 2 æ ö Q ç ÷ è ø are the roots of 2 ax + bx + c = 0, a ¹ 0 then

In a triangle $P Q R, \angle R=\frac{\pi}{2}$. If $\tan \left(\frac{P}{2}\right)$ and $-\tan \left(\frac{Q}{2}\right)$ are the roots of $a x^{2}+b x+c=0, a \neq 0$ then