What is the double angle identity for in terms of ?
The question Iím working on is
I have tried using
And the double angle identity for
The best Iíve got is
, which it might not be.
Maybe I should be using the half angle identity, but I'm not sure how.
I know I have to work at these, but if someone could point me in the right direction with this Iíd be very grateful.
This is another approach I had tried, but I had got completely stuck, my factoring is not so good. I am very grateful for your reply and I will enjoy working through your method. Thank you very much for taking the time to reply, I am very grateful. It is enormously helpful.