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-   -   Proving trig identity (https://www.askmehelpdesk.com/showthread.php?t=179645)

  • Feb 2, 2008, 12:14 PM
    mainepenguin
    Proving trig identity
    Hey guys I've been working on this one trig identity for about an hour and I can't seem to make it work it out. Any help will be appreciated

    (tan/1+cos) + (sin/1-cos) = cos + sec*csc
  • Feb 2, 2008, 12:54 PM
    galactus
    The identity is equal to cot(x)+csc(x)sec(x), not cos(x).



    You can cross multiply, this gives:



    Now, if you expand and simplify each, you will whittle it down to the right side.

    Which is cot(x)+csc(x)sec(x). Having that cos(x) in there may have been the problem.

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