Results 1 to 2 of 2

Math Help - Yet another Trig identity

  1. #1
    Newbie
    Joined
    Aug 2009
    Posts
    1

    Yet another Trig identity

    Removed
    Last edited by GeoffP; August 15th 2009 at 11:34 PM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Rhymes with Orange Chris L T521's Avatar
    Joined
    May 2008
    From
    Chicago, IL
    Posts
    2,844
    Thanks
    3
    Quote Originally Posted by GeoffP View Post
    Q. Prove Cot^2t-Cos^2t=Cot^2t . Cos^2t

    I have changed to sines/Cosines but seem to end up going round in circles. I have also tried working on both sides.

    I think i need a combination of Cos^2t= 1- Sin^2t and Cot^2t = Cos^2t / Sin^2 t.

    Any assistance appreciated.


    Cheers
    Note that \cot^2t-\cos^2t=\frac{\cos^2t}{\sin^2t}-\cos^2t=\left(\frac{1}{\sin^2t}-1\right)\cos^2t=\left(\csc^2t-1\right)\cos^2t

    Apply another identity, and you're done.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. trig identity help...
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: May 17th 2011, 10:43 AM
  2. Another trig identity
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: February 14th 2011, 05:54 PM
  3. Trig Identity
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: April 18th 2010, 06:43 PM
  4. Trig identity
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: March 10th 2010, 12:39 AM
  5. Odd Trig Identity
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: August 27th 2008, 09:06 PM

Search Tags


/mathhelpforum @mathhelpforum