Найти в градусах: arctg(ctg 35пи/9)+2arccos(cos 35пи/9) Буду благодарна)

https://www.google.com.ua/search?ie=UTF-8&hl=ru&q=arctg(ctg%2035пи%2F9)%2B2arccos(cos%2035пи%2F9)&gws_rd=ssl#hl=ru&q=arctg(ctg+(35*+Pi%2F9))%2B2*arccos(cos+(35*Pi%2F9))+%D0%B2+%D0%B3%D1%80%D0%B0%D0%B4%D1%83%D1%81%D0%B0%D1%85