Results 1 to 5 of 5

Thread: not sure what to do

  1. #1
    Newbie
    Joined
    Nov 2017
    From
    Kansas
    Posts
    1

    not sure what to do

    cos^2(18) - sin^2(18)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    21,841
    Thanks
    2860
    Awards
    1

    Re: not sure what to do

    Quote Originally Posted by notme View Post
    cos^2(18) - sin^2(18)
    HINT: $\cos(2\theta)=\cos^2(\theta)-\sin^2(\theta)$
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor

    Joined
    Apr 2005
    Posts
    19,843
    Thanks
    3064

    Re: not sure what to do

    What did this problem ask you to do? What you have is a trig expression. What do you want to do with it?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    Feb 2015
    From
    Ottawa Ontario
    Posts
    1,880
    Thanks
    348

    Re: not sure what to do

    Quote Originally Posted by HallsofIvy View Post
    What do you want to do with it?
    How would I know?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor

    Joined
    Apr 2005
    Posts
    19,843
    Thanks
    3064

    Re: not sure what to do

    Nobody was talking to you!
    Follow Math Help Forum on Facebook and Google+

Search Tags


/mathhelpforum @mathhelpforum