Results 1 to 3 of 3

Math Help - [SOLVED] Simple Identity Confirmation

  1. #1
    Member
    Joined
    Sep 2009
    Posts
    148

    Cool [SOLVED] Simple Identity Confirmation

    \frac{1-tan^2x}{ 1+tan^2x} = 1-2sin^2x

    LHS = \frac{1 - \frac{sin^{2}x}{cos^{2}x}}{1+\frac{sin^{2}x}{cos^{  2}x}}

    =\frac{cos^{2}x-sin^{2}x}{1}

    =1-sin^2x-sin^2x

    =1-2sin^2x

    Am I on the right track?
    Last edited by Grandad; May 7th 2010 at 01:39 AM. Reason: Fixed LaTeX
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Grandad's Avatar
    Joined
    Dec 2008
    From
    South Coast of England
    Posts
    2,570
    Thanks
    1
    Hello unstopabl3
    Quote Originally Posted by unstopabl3 View Post
    \frac{1-tan^2x}{ 1+tan^2x} = 1-2sin^2x

    LHS = \frac{1 - \frac{sin^{2}x}{cos^{2}x}}{1+\frac{sin^{2}x}{cos^{  2}x}}

    =\frac{cos^{2}x-sin^{2}x}{1}

    =1-sin^2x-sin^2x

    =1-2sin^2x

    Am I on the right track?
    Yes!

    Grandad
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Sep 2009
    Posts
    148
    Great, thanks for fixing the Latex and your quick reply!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Need confirmation on set identity problem
    Posted in the Discrete Math Forum
    Replies: 4
    Last Post: February 2nd 2010, 02:08 PM
  2. [SOLVED] proving sin, and confirmation needed.
    Posted in the Trigonometry Forum
    Replies: 11
    Last Post: February 2nd 2010, 11:20 AM
  3. [SOLVED] Help with simple Trig Identity Q
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: May 12th 2009, 07:33 PM
  4. Replies: 3
    Last Post: March 6th 2009, 05:05 PM
  5. Simple identity
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: May 21st 2007, 02:46 AM

Search Tags


/mathhelpforum @mathhelpforum