Results 1 to 4 of 4

Math Help - pi/12

  1. #1
    Newbie
    Joined
    Mar 2011
    Posts
    4

    pi/12

    how can i use the difference identity to find pi/12, because i keep getting 0 when i try it.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,829
    Thanks
    1602
    Are you sure you're not trying to find \displaystyle \sin{\frac{\pi}{12}} or \displaystyle \cos{\frac{\pi}{12}}?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Mar 2011
    Posts
    4
    Ii is Cos(pi/12) i guess i looked at it wrong, i did not see the Cosine
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,829
    Thanks
    1602
    Either evaluate \displaystyle \cos{\left(\frac{\pi}{3} - \frac{\pi}{4}\right)} using the angle difference identity, or evaluate \displaystyle \cos{\left(\frac{1}{2}\cdot \frac{\pi}{6}\right)} using the half angle identity.
    Follow Math Help Forum on Facebook and Google+

Search Tags


/mathhelpforum @mathhelpforum