1)
Let .
Then
2)
3)
4)
I'm really not sure where to start with these, a solution would be perfect but a method would also be an easier point i guess as i could probably solve them if i knew where to start.
1)
2)
3)
4) find the value of sinx and cosx when cos2x = 1/9
any help is appreciated, its probably simple and i just cant remember the method =/