I know i'm supposed to use double angle formula, but i still don't get how to get my answer. I am to Express cos^2 (2x) in terms of cos 4x.(Crying)

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- May 13th 2012, 06:18 AMjohnrealExpress cos^2 (2x) in terms of cos 4x
I know i'm supposed to use double angle formula, but i still don't get how to get my answer. I am to Express cos^2 (2x) in terms of cos 4x.(Crying)

- May 13th 2012, 06:20 AMProve ItRe: Express cos^2 (2x) in terms of cos 4x
Do you know that ? Let .

- May 13th 2012, 06:27 AMjohnrealRe: Express cos^2 (2x) in terms of cos 4x
Is it + 1 or -1 at the end?

- May 13th 2012, 07:00 AMProve ItRe: Express cos^2 (2x) in terms of cos 4x