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-   -   Trig identity (https://www.askmehelpdesk.com/showthread.php?t=78332)

  • Apr 2, 2007, 04:42 AM
    adam1231
    trig identity
    cot(x) + tan(x)
    1-tan(x) 1-cot(x) = 1+tan(x)+cot(x)



    Please verify if you can!!
  • Apr 2, 2007, 06:06 PM
    galactus
    There are always many methods to tackle these critters, but I will do a somewhat lengthy one so you can see the identities. OK?



    Like any addition, you must make the denominators the same:

    Let's multiply the right side by -tan(x):



    Now you have:





    Using :

    We simplify it down to:



    Since



    So, we're getting there:





    Now,

    Therefore, we have... drum roll please:




    This is a rather lengthy derivation but if you can follow it, you can follow amore simplistic method.
  • Apr 2, 2007, 07:42 PM
    adam1231
    I appreciate the reply but I still am confused by some of your answer. First I don't see how you derived the new equation when you put it all in terms of sin and cos. Then I don't see how 1/sin(x)cos(x)can be equal to cot(x)+tan(x). If you could elaborate more I would appreciate it.
  • Apr 3, 2007, 03:59 AM
    galactus
    That's how you do these things a lot of the time is by converting to sine and cosine.

    You must know variuos identities in order to transform the left side into the right side.




    So, we have:



    Cross multiply:



    Remember,

    Therefore:

  • Apr 10, 2007, 08:25 PM
    luffy
    Quote:

    Originally Posted by adam1231
    cot(x) + tan(x)
    1-tan(x) 1-cot(x) = 1+tan(x)+cot(x)



    Please verify if you can!!!!

    I have no idea
  • Apr 10, 2007, 08:27 PM
    luffy
    I wish I knew who you were. I have mrs.philips as my precal teacher

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