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-   -   Proving identities (https://www.askmehelpdesk.com/showthread.php?t=561571)

  • Mar 12, 2011, 05:52 AM
    cute.2
    proving identities
    sec times tan times sin equals?
  • Mar 13, 2011, 02:59 AM
    Unknown008

    Is that:



    ?

    Convert the sec and tan ratios into sin and cos ratios first.
  • Mar 13, 2011, 04:47 AM
    xx_hannah_xx
    if it is secθ x tanθ x sinθ , then its pretty simple
    secθ = 1/tanθ
    1/tanθ x tanθ x sinθ
    the 1/tanθ will cancel with the tanθ
    so
    secθ x tanθ x sinθ = sinθ since the first two terms cancel each other out
  • Mar 13, 2011, 04:52 AM
    Unknown008
    Quote:

    Originally Posted by xx_hannah_xx View Post
    if it is secθ x tanθ x sinθ , then its pretty simple
    secθ = 1/tanθ
    1/tanθ x tanθ x sinθ
    the 1/tanθ will cancel with the tanθ
    so
    secθ x tanθ x sinθ = sinθ since the first two terms cancel each other out

    That is not correct.


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