(sin α + sin 5 α)/(cos α + cos 5 α)

Question

(sin α + sin 5 α)/(cos α + cos 5 α)

Answer 1

(sin α + sin 5 α)= 2Sin3α Cos2α
(cos α + cos 5 α) = 2Cos3α Cos2α
делим и пишем ответ: tg3α