Question

Решитее.............

Answer 1

$3log_2(log_416)+log_{0.5}2=3log_2(log_44^2)+log_{2^{-1}}2= \ =3log_22+(-1)=3cdot1-1=3-1=2$

$ctg2a= frac{1-tg^2a}{2tga} = frac{1-4^2}{2cdot4} = frac{1-16}{8} =- frac{15}{8}$