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1st and 2nd Derivative

  • Thread starter LiHJ
  • Start date
  • #1
43
2

Homework Statement



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.


Homework Equations



image.jpg
[/B]


The Attempt at a Solution





image.jpg
 

Answers and Replies

  • #2
ehild
Homework Helper
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1,823
I do not see that you did any differentiation.
 
  • #3
43
2
Sorry forgot to copied these as well

image.jpg
 
  • #4
ehild
Homework Helper
15,427
1,823
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.
 
  • #5
43
2
Thank you
 

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