Results 1 to 3 of 3

Math Help - find the limit

  1. #1
    Member
    Joined
    Apr 2009
    From
    Jerusalem - Israel
    Posts
    108

    find the limit

    can you please find:
     <br />
\displaystyle \lim_{x\rightarrow -\infty} {e}^{4x} \sin x<br />
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by razemsoft21 View Post
    can you please find:
     <br />
\displaystyle \lim_{x\rightarrow -\infty} {e}^{4x} \sin x<br />
    Use the fact that -1 \leq \sin (x) \leq 1 and consider the behaviour of e^{4x}.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Math Engineering Student
    Krizalid's Avatar
    Joined
    Mar 2007
    From
    Santiago, Chile
    Posts
    3,654
    Thanks
    13
    i've seen many of these problems and it seems the people who ask them never remember this useful fact:

    let a_n\to0 as n\to\infty, then if b_n is bounded, we have a_nb_n\to0 as well.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 12
    Last Post: August 26th 2010, 10:59 AM
  2. Find the limit
    Posted in the Calculus Forum
    Replies: 3
    Last Post: November 15th 2009, 04:01 PM
  3. Find the Limit
    Posted in the Calculus Forum
    Replies: 4
    Last Post: September 18th 2009, 07:19 PM
  4. find limit
    Posted in the Calculus Forum
    Replies: 5
    Last Post: February 28th 2008, 10:54 AM
  5. Replies: 15
    Last Post: November 4th 2007, 07:21 PM

Search Tags


/mathhelpforum @mathhelpforum