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1st and 2nd Derivative

  1. Feb 5, 2015 #1
    1. The problem statement, all variables and given/known data

    Dear Mentors PF Helpers,

    Here's my question:

    image.jpg

    I see it from my textbook with it solutions copied down below. Wonder is there another way to do it.
    Thank you for your time.


    2. Relevant equations

    image.jpg



    3. The attempt at a solution



    image.jpg
     
  2. jcsd
  3. Feb 5, 2015 #2

    ehild

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    Gold Member

    I do not see that you did any differentiation.
     
  4. Feb 5, 2015 #3
    Sorry forgot to copied these as well

    image.jpg
     
  5. Feb 5, 2015 #4

    ehild

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    Gold Member

    I do not see any other way than doing the differentiation. You may replace sec(x) by 1/cos(x), and replace the argument of the logarithm by (1+sinx)/cos(x) before differentiating.
     
  6. Feb 5, 2015 #5
    Thank you
     
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