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-   -   Proving tangent formula (https://www.askmehelpdesk.com/showthread.php?t=401341)

  • Sep 30, 2009, 10:53 AM
    paola818
    proving tangent formula
    proving tangent formula
    (tangent squared theta = 1-cos squared theta over 1+cos sqared theta)
  • Sep 30, 2009, 02:06 PM
    ArcSine
    Do you mean?.



    If so, try evaluating both sides of the proposed equality for a random value of theta.
  • Oct 1, 2009, 08:55 AM
    Unknown008

    Are you sure this formula is correct? I can't seem to get it. I tried several ways, no success.
  • Oct 1, 2009, 09:12 AM
    ArcSine
    Agreed... the way I structured the equation it's definitely NOT an identity. That's why I asked Paola to run a simple 'test' with any random pick for theta... just about any angle measure would provide the counterexample to the assertion that it's an ID.

    On the other hand, maybe Paola intended a different 'setup' of the equation. Just have to stand by for that.

    Cheers
  • Oct 1, 2009, 09:18 AM
    Unknown008

    I also tried , but to no avail...
  • Oct 1, 2009, 03:21 PM
    Lightning55
    Quote:
    Originally Posted by Unknown008 View Post
    I also tried , but to no avail...
    Do you think it could be:




    That should make it easily solvable.
  • Oct 2, 2009, 09:43 AM
    Unknown008

    Yes, that is true... I wonder where the OP got that "1+" up there...

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