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!

Limit with trigonometric functions

  1. Nov 23, 2009 #1
    1. The problem statement, all variables and given/known data

    True or false?

    lim Tanx/(1-Cosx) = lim Sec2x/Sinx = Infinity

    (limits are as x approaches [tex]\pi[/tex] from the left)

    3. The attempt at a solution

    I tried just plugging [tex]\pi[/tex] into x in the first limit, and I ended up getting 0/2, which exists but is just 0. So I said false. Am I simplifying it too much? because what I did seems to make sense but it looks like that's not what they wanted me to do.
     
    Last edited: Nov 23, 2009
  2. jcsd
  3. Nov 23, 2009 #2
    Re: limit

    Isn't it just 0/2=0?
     
  4. Nov 24, 2009 #3

    Mark44

    Staff: Mentor

    Re: limit

    The original limit was neither of the indeterminate forms [0/0] or [infinity/infinity], so L'Hopital's Rule doesn't apply here. Your first approach was correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Limit with trigonometric functions
Loading...