Question

решите пожалуйста,решение не обязательно

Answer 1

$frac{2sinfrac{pi}{9}-5sinfrac{8pi}{9}}{6cosfrac{29pi }{18}-3cosfrac{7pi}{18}} =frac{2sinfrac{pi}{9}-5sin(pi -frac{pi}{9})}{6cos(frac{3pi }{2}+frac{pi}{9})-3cos(frac{pi}{2}-frac{pi}{9})} =frac{2sinfrac{pi}{9}-5sinfrac{pi}{9}}{6sinfrac{pi}{9}-3sinfrac{pi}{9}} =\\= frac{-3sinfrac{pi}{9}}{3sinfrac{pi}{9}} =-1$