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  1. MHB Apprentice

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    #1
    How do I use the double angle identity in order to derive this expression: cos6(u)?

  2. Pessimist Singularitarian
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    #2
    I am assuming you mean:

    $ \displaystyle \cos^6(u)$

    However, I'm not sure what you mean by deriving it. Can you post the question in its entirety?

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