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: Trig identity limit

  1. Sep 29, 2009 #1
    1. The problem statement, all variables and given/known data

    lim t3/tan32t

    3. The attempt at a solution

    I am stuck I have alot of trouble with trig identities
  2. jcsd
  3. Sep 29, 2009 #2
    Do you know L'hôpital's rule? That might be the easiest way. If not, rewrite tan2t as sin2t/cos2t first. cos(2*0) won't cause a problem, but the t and sin2t will. See if you can get it to look like sin2t/t.
  4. Sep 29, 2009 #3
    lim= 2*t*2*t*2*t*cos32t/2*sin2t*2*sin2t*2*sin2t\

    so all the 2*t cancel the sin2t leaving cos32t/2*2*2 so limit=1/6

    is this correct??
  5. Sep 29, 2009 #4
    2*2*2=8, not 6. :wink:
  6. Sep 29, 2009 #5
    haha ya wow. :)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook