Question

Tg(pi/4-a) tg a=3Ррпопососомомомо

Answer 1

$tg(\frac{\pi}{4}-a)=\frac{tg\frac{\pi}{4}-tga}{1+tg\frac{\pi}{4}\cdot tga}=\frac{1-3}{1+1\cdot 3}=\frac{-2}{4}=-\frac{1}{2}$