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-   -   How do you show that cos2x+1=2cos^2x (https://www.askmehelpdesk.com/showthread.php?t=772616)

  • Oct 24, 2013, 10:17 PM
    geekyemokid
    How do you show that cos2x+1=2cos^2x
    I can't figure it out please help!
  • Oct 24, 2013, 11:16 PM
    Alty
    Post what you think the answer is so we can critique it. Site rules are that we won't do homework, won't give you the answer. So show your work, what you think it is, even if you think it's stupid, and we can help. We can't give you the answer though, that's something you have to figure out.
  • Oct 25, 2013, 07:47 AM
    ebaines
    Are you familiar with the identies for cos(2x)? Start with that and it comes right out.

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