How to find exact values of circular functions?

Question

Can someone please explain how to do question 1g? Thanks!

3695 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-11-09T17:17:29

See below.

For 1g.

Notice that #420^o# is one complete revolution plus #60^o#. So we are really only looking for the sin cos and tan of #60^o#

#sin(60^o)=sqrt(3)/2#

#cos(60^o)=1/2#

#tan(60^o)=sqrt(3)#