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!

Trigonometric identity

  1. Oct 13, 2012 #1
    1. The problem statement, all variables and given/known data



    2. Relevant equations

    Any trig formulas

    3. The attempt at a solution
    one_0001.jpg
    one_0002.jpg

    The yellow paper is me switching everything to sin and cos to see if that helps but it doesn't. I'm completely stuck here.
     
  2. jcsd
  3. Oct 13, 2012 #2
    Oh yeah, it's problem fifty. Forgot to say that :).
     
  4. Oct 13, 2012 #3

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    What yellow paper ?
     
  5. Oct 13, 2012 #4
    You can't see the images?
     
  6. Oct 14, 2012 #5

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Not at all.
     
  7. Oct 14, 2012 #6
    http://img839.imageshack.us/img839/2928/one0001.jpg [Broken]

    Does that work?
     
    Last edited by a moderator: May 6, 2017
  8. Oct 14, 2012 #7

    jedishrfu

    Staff: Mentor

    at the step where you combine the two fractions you sucked in the minus sign and then lost a minus as you multiplied the second term with 1-tan(theta). Do you see that?

    you should instead have: 4 tan(theta) / ( 1 - tan^2(theta) )
     
  9. Oct 14, 2012 #8
    Got it. Thank you!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Trigonometric identity
  1. Trigonometric Identity (Replies: 8)

  2. Trigonometric Identity (Replies: 8)

  3. Trigonometric identity (Replies: 1)

  4. Trigonometric Identity (Replies: 1)

Loading...