Tg(ß-пи/4)=1/6 Найти tgß

Question

Tg(ß-пи/4)=1/6
Найти tgß

Answer 1

(tgb-tgπ/4)/(1*tgb*tgπ/4)=(tgb-1)/(1+tgb)=1/6
6tgb-6=1+tgb
6tgb-tgb=1+6
5tgb=7
tgb=7/5=1,4