1. Feb 5, 2015 #1

   LiHJ

   

   1. The problem statement, all variables and given/known data
   
   Dear Mentors PF Helpers,
   
   Here's my question:
   
   
   
   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
   
   
   
   
   3. The attempt at a solution
   
   
   
   

    

   LiHJ, Feb 5, 2015
2. 
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3. Feb 5, 2015 #2

   ehild

   

   Homework Helper

   Gold Member

   I do not see that you did any differentiation.

    

   ehild, Feb 5, 2015
4. Feb 5, 2015 #3

   LiHJ

   

   Sorry forgot to copied these as well
   
   

    

   LiHJ, Feb 5, 2015
5. Feb 5, 2015 #4

   ehild

   

   Homework Helper

   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.

    

   ehild, Feb 5, 2015
6. Feb 5, 2015 #5

   LiHJ

   

   Thank you

    

   LiHJ, Feb 5, 2015

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