Results 1 to 3 of 3

Math Help - limit cotx

  1. #1
    Newbie
    Joined
    Sep 2008
    Posts
    4

    limit cotx

    here is the problem

    lim x approaches pi of cotx

    would anyone please tell me how to prove the limit doesnt exist by using sided limit from both sides. my prof told me that i have to show x approaches PI from the left and from the right.

    thank you
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Jun 2008
    Posts
    792
    Yes, you have to do what your professor told you to do. Recall that:

    \cot{x} = \frac{\cos{x}}{\sin{x}}

    ======

    EXTRA:

    \sin{\pi} = 0

    \cos{\pi} = -1
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2008
    Posts
    4
    thank you for your help. i knew what you said but i got stuck in showing x approaches PI from the left and from the right
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Simplification of -ln| cscx - cotx |
    Posted in the Calculus Forum
    Replies: 10
    Last Post: August 16th 2011, 02:22 PM
  2. Differentiate f(x) = (3x^2) ( cosx)(cotx)
    Posted in the Calculus Forum
    Replies: 1
    Last Post: July 14th 2011, 12:50 AM
  3. Integral of 1/cotx
    Posted in the Calculus Forum
    Replies: 1
    Last Post: May 15th 2011, 01:46 AM
  4. series expansion of cotx
    Posted in the Calculus Forum
    Replies: 2
    Last Post: October 1st 2009, 01:24 PM
  5. integral with cotx
    Posted in the Calculus Forum
    Replies: 3
    Last Post: September 7th 2007, 02:06 PM

Search Tags


/mathhelpforum @mathhelpforum