How do you tackle these?

1.2cos^2 4x-1

sin4xcos4x

2. 1-4sin^2x+4sin^4x

The answers to the first is 2cot8x and the second is cos^22x. I would like to see the step by step process.

Help would be appreciated thanks!

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- Jul 23rd 2007, 07:51 PMandrewsxTrig iden: Quadruple angle formulas
How do you tackle these?

1.__2cos^2 4x-1__

sin4xcos4x

2. 1-4sin^2x+4sin^4x

The answers to the first is 2cot8x and the second is cos^22x. I would like to see the step by step process.

Help would be appreciated thanks! - Jul 23rd 2007, 08:18 PMtukeywilliams
Is it:

1. and

2. ? - Jul 23rd 2007, 09:00 PMJhevon