if A, B and C are interior angles of a `triangle` ABC, then show that `cos((B+C)/2)` = `sin (A/2)`

Описание к видео if A, B and C are interior angles of a `triangle` ABC, then show that `cos((B+C)/2)` = `sin (A/2)`

if A, B and C are interior angles of a `triangle` ABC, then show that `cos((B+C)/2)` = `sin (A/2)`

Комментарии

Информация по комментариям в разработке