Results 1 to 2 of 2

Math Help - proving identity

  1. #1
    Senior Member
    Joined
    Nov 2008
    Posts
    425

    proving identity

    prove that (cscx-cotx)^2=(1-cosx)/(1+cosx)

    my steps are as follows:
    LS

    (cscx-cotx)^2
    (1/sinx-1/tanx)^2
    (1/sinx-cosx/sinx)^2
    [(1-cosx)/sinx]^2
    [(1-2cosx-cos^x)/sin^2x]

    now what should I do to get it to equal the other side? I am stuck here
    Last edited by skeske1234; March 29th 2009 at 01:18 PM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor red_dog's Avatar
    Joined
    Jun 2007
    From
    Medgidia, Romania
    Posts
    1,252
    Thanks
    5
    \frac{(1-\cos x)^2}{\sin^2x}=\frac{(1-\cos x)^2}{1-\cos^2x}=\frac{(1-\cos x)^2}{(1-\cos x)(1+\cos x)}=\frac{1-\cos x}{1+\cos x}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Proving an identity
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: July 17th 2011, 01:23 PM
  2. Proving Another Identity
    Posted in the Trigonometry Forum
    Replies: 7
    Last Post: June 6th 2011, 11:34 AM
  3. Help proving an identity
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: April 22nd 2010, 12:57 PM
  4. Proving an identity that's proving to be complex
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: July 21st 2009, 02:30 PM
  5. proving an identity
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: March 16th 2008, 11:03 AM

Search Tags


/mathhelpforum @mathhelpforum