-2tg 3п/7 - 5ctg п/14

Question

-2tg 3п/7 - 5ctg п/14

Answer 1

-2tg 3п/7 - 5ctg п/14=-(2tg 3п/7 +5ctg п/14)=-(2tg (п/2-п/14) + 5ctg п/14)=
=-(2сtg п/14+ 5ctg п/14)=-2 ctg п/14