1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Exact value of tan

  1. Oct 11, 2004 #1
    How do I find the exact value of tan 165 and tan 285
    I think it has got something to do with
    sinx
    tanx = cosx
     
  2. jcsd
  3. Oct 11, 2004 #2
    Susan meets Maria on PF ground and ready to fight

    The best best way is use a calculator!
    The best way is pi/12=pi/3-pi/4 and then try applying the formula calculating tan(pi/3-pi/4), your goning to get there

    Susan
     
    Last edited: Oct 11, 2004
  4. Oct 11, 2004 #3
    that`s not enough on a test
     
  5. Oct 11, 2004 #4

    Hurkyl

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    do you know how to find sin 165?
     
  6. Oct 11, 2004 #5
    why:mad: not enough ?
     
  7. Oct 11, 2004 #6
    I`ve found sin 165 and tan 165,and I`ve tried
    sinx
    tanx = cosx
    but I can`t get the answer right..
     
  8. Oct 11, 2004 #7

    Hurkyl

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    All right, I'm confused as to just what you're trying to do... I thought you said you were unable to find tan 165?
     
  9. Oct 11, 2004 #8
    oh sorry..
    sin165
    What I meant was tan1 65 = cos165

    I know sin 165and cos 165.. Have I got things right so far?
     
  10. Oct 11, 2004 #9

    Hurkyl

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Have you been trying to write tan 165 = sin 165 / cos 165?

    If you have the right values for sin 165 and cos 165, then dividing will give you the right value for tan 165.

    Keep in mind that there are lots of ways to write the exact value for tan 165, so if the answer doesn't look like the books answer, see if you can find a way to be sure they are the same or different.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?