kjeanch Messages 2 Reaction score 0 Thread starter Dec 16, 2016 #1 How do I use the double angle identity in order to derive this expression: cos6(u)?
MarkFL Gold Member MHB Messages 13,284 Reaction score 12 Dec 17, 2016 #2 I am assuming you mean: $$\cos^6(u)$$ However, I'm not sure what you mean by deriving it. Can you post the question in its entirety?
I am assuming you mean: $$\cos^6(u)$$ However, I'm not sure what you mean by deriving it. Can you post the question in its entirety?