Question

обчисліть
tg27*+tg18*/1-tg27*·tg18

Answer 1

$tg( \alpha + \beta )=\frac{tg \alpha +tg \beta }{1-tg \alpha \cdot tg \beta }\; \; \; \to \; \\\\\frac{tg27+tg18}{1-tg27\cdot tg18}=tg(27+18)=tg45=1$