Just double the angle in your formula. I suspect you are trying to "over think" the problem here...Originally Posted by macca101
Ok Thanks for that.Originally Posted by ThePerfectHacker
I thought I was stuck then boy I'm I struggling now. The question goes on ...
Use the answer above and another half angle formula
To show that
Apologies if I should have started a new thread for this. Thought it would be OK to continue as it relates to the original post.