March 31st, 2010, 05:03 PM  #1 
Newbie Joined: Mar 2010 Posts: 1 Thanks: 0  limit of an intermediate form
I want to find cos^2 x/2^x as x approaches infinity My first instinct is to use L'Hospitals rule and differentiate unfortunately this leads to 2 sin x cos x/(ln 2 2^x) Which is utterly unhelpful I'm really stuck on this one. If anybody has any insight I would really appreciate BTW from a table of values and a graph I am very confident that the answer is zero 
March 31st, 2010, 05:25 PM  #2  
Global Moderator Joined: May 2007 Posts: 6,804 Thanks: 715  Re: limit of an intermediate form Quote:
 

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