1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Limits at infinity of trigometric function

  1. Sep 17, 2010 #1
    1. The problem statement, all variables and given/known data


    lim (x→pi)〖sin(x-pi)/(x-pi)〗

    2. Relevant equations

    i dont know if we should use trig identity

    sin(a-b)= sinA cos B- CosA sin B

    3. The attempt at a solution
    i use identities to solve that, i did not get the answer. i tried to multiply by conjugate, did not work also.
     
    Last edited: Sep 17, 2010
  2. jcsd
  3. Sep 17, 2010 #2

    vela

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    Think about the squeeze theorem.
     
  4. Sep 17, 2010 #3
    You could use a substitution, u = x - [itex]\pi[/itex], and that limit should be familiar.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook