Results 1 to 3 of 3

Math Help - finding limit of trig

  1. #1
    Junior Member
    Joined
    Jan 2010
    Posts
    62

    finding limit of trig

    any idea on how to solve this i have no idea where to start on these type of functions ?

    limit of (4x/tanx)
    x> (pie/4)

    x is approaching pie over 4
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,234
    Thanks
    27
    What do you think of this?

    \lim_{x\to \frac{\pi}{4}}\frac{4x}{\tan x}

    = \frac{4\frac{\pi}{4}}{\tan \frac{\pi}{4}}

     <br />
= \frac{\pi}{1} = \pi<br />
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Jun 2009
    From
    United States
    Posts
    676
    Thanks
    19
    Quote Originally Posted by maybnxtseasn View Post
    any idea on how to solve this i have no idea where to start on these type of functions ?

    limit of (4x/tanx)
    x> (pie/4)

    x is approaching pie over 4
    It's in determinant form isn't it? You don't need to do any simplification. You can use direct substitution.

    \tan\left(\frac{\pi}{4}\right)=1

    4\left(\frac{\pi}{4}\right)=\pi

    So \lim_{x->\frac{\pi}{4}}\frac{4x}{\tan(x)}=\pi
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Finding limit of this function, using Limit rules
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: February 27th 2011, 01:12 PM
  2. Finding intersection of trig and non trig function
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: February 19th 2011, 06:53 PM
  3. Finding a limit. Finding Maclaurin series.
    Posted in the Calculus Forum
    Replies: 2
    Last Post: May 18th 2010, 10:04 PM
  4. trig limit
    Posted in the Calculus Forum
    Replies: 7
    Last Post: October 25th 2008, 01:33 PM
  5. finding a limit with trig
    Posted in the Calculus Forum
    Replies: 2
    Last Post: September 30th 2008, 01:15 PM

Search Tags


/mathhelpforum @mathhelpforum