1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Are these two integral formulas the same?

  1. Sep 26, 2007 #1
    In my book, we were give:

    int of tanx dx = - ln|cos x| + c

    and later I cam across:

    int of tanx dx = ln |sec x| + c

    --should I use these interchangeably or what?
     
  2. jcsd
  3. Sep 26, 2007 #2

    D H

    User Avatar
    Staff Emeritus
    Science Advisor

    What is the relation between [itex]\cos x[/itex] and [itex]\sec x[/itex]?
     
  4. Sep 26, 2007 #3
    [tex]ln\left(\frac{1}{x}\right) = -ln x \quad \textrm{and} \quad \sec x = \frac{1}{\cos x}[/tex]

    So yes, you can use them interchangeably.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Are these two integral formulas the same?
  1. Integration formula (Replies: 5)

Loading...