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-   -   Verify this identity: cos^2x=(1/2)cos2x (https://www.askmehelpdesk.com/showthread.php?t=650298)

  • Apr 11, 2012, 09:06 PM
    mollieblake
    Verify this identity: cos^2x=(1/2)cos2x
    A friend asked me to try to help, and I can't get it.
  • Apr 11, 2012, 09:51 PM
    rpray2007
    I think the identity you are trying to solve for is:



    Remember the identities:

    and

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