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Homework Help: Explain why this simplifies

  1. Sep 26, 2008 #1
    ok, i have this and know what it should simplify to, but why?


    i know it simplifies to


    but my book doesnt explain what exactly happens. could someone please shed some light and explain what exactly happens
  2. jcsd
  3. Sep 26, 2008 #2


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    Homework Helper

    I think you mistyped something. It doesn't simplify to that. Try for example x =pi/4.
  4. Sep 26, 2008 #3


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    Science Advisor

    I'm parsing his message as:


    Does that make sense?

    Edit: No, I misread!
  5. Sep 26, 2008 #4
    thats what i kept seeing.

    i see it simplifies to one.

    the answer in the book shows the answer i previously gave over (1-sinx)^2

    then the final answer being

    1 over (1-sinx)
  6. Sep 26, 2008 #5


    then the final being

    PS sorry for the double posting
  7. Sep 26, 2008 #6


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    Homework Helper

    That minus sign, which was absent in your original post, makes the whole world of difference. To simplify, just expand the numerator out and apply a trigo identity.
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