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    geekyemokid's Avatar
    geekyemokid Posts: 1, Reputation: 1
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    #1

    Oct 24, 2013, 10:17 PM
    How do you show that cos2x+1=2cos^2x
    I can't figure it out please help!
    Alty's Avatar
    Alty Posts: 28,317, Reputation: 5972
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    #2

    Oct 24, 2013, 11:16 PM
    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.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Oct 25, 2013, 07:47 AM
    Are you familiar with the identies for cos(2x)? Start with that and it comes right out.
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