
Linear Algebra Linear Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
January 28th, 2010, 07:04 PM  #1 
Member Joined: Jan 2010 Posts: 82 Thanks: 0  ...and still. trouble with complex frac. in limit problem
This is slightly embarrassing but I'll put my pride out of the way in hopes of learning what boneheaded thing I'm doing wrong so that I might correct it. Have to use the limit equation to find the derivative. super tedious. *sigh* I'm posting here rather than in calculus because the area in question (I think) is algebraic in nature.

January 28th, 2010, 07:06 PM  #2 
Member Joined: Jan 2010 Posts: 82 Thanks: 0  Re: ...and still. trouble with complex frac. in limit problem
well, i see the first thing wrong is that I multiplied by a sqrt(g+h+1). doh!

January 28th, 2010, 10:49 PM  #3 
Newbie Joined: Jan 2010 Posts: 21 Thanks: 0  Re: ...and still. trouble with complex frac. in limit problem
This is how I have made it : Eventually : 
January 29th, 2010, 12:20 AM  #4 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: ...and still. trouble with complex frac. in limit problem
Not easy at all. A couple of typos: at the end of the longest line there is a factor (x0+1), where the 0 should be a subscript; and the denominator in the secondlast line should not begin "h" (as it's been cancelled). 
January 29th, 2010, 12:56 AM  #5 
Newbie Joined: Jan 2010 Posts: 21 Thanks: 0  Re: ...and still. trouble with complex frac. in limit problem
Man! You got some good eyes, I haven't noticed it. 10x BTW  oddlogic, can I suggest that you try LaTeX or at least Windows Equation? I have tried OpenOffice Math but it wasn't pleasant. From experience, LaTeX is the best. 
January 29th, 2010, 04:06 AM  #6 
Member Joined: Jan 2010 Posts: 82 Thanks: 0  Re: ...and still. trouble with complex frac. in limit problem
yes you may fur. I was just trying to make it easier to read at my own expense and the expense in openoffice math is that it's finicky regarding parenthesis, thus time consuming. Thanks to you both. I will apply this immediately.

January 29th, 2010, 08:55 AM  #7 
Member Joined: Jan 2010 Posts: 82 Thanks: 0  Re: ...and still. trouble with complex frac. in limit problem
omg felt really silly after seeing these worked this morning. I was trying to make things much more complicated than they need be. These are simple problems. To anyone working these problems, there is no need to multiply anything on bottom (most of the time) and take your first opportunity to make the h=0. With that said, pay particular attention to the way that things cancel on top in early examples, so that you can apply it in later examples without much hassle. 

Tags 
complex, frac, limit, problem, trouble 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
In what situation frac of limits equals to limit of frac?  stainburg  Calculus  17  November 24th, 2013 12:14 AM 
trouble in infinite limit  Zynoakib  Calculus  2  October 19th, 2013 06:02 AM 
Having Trouble Deriving limit as x>infinity  saxophonemaster  Calculus  12  September 23rd, 2012 09:41 PM 
Trouble Inverting Complex Matrix  mmmboh  Linear Algebra  2  January 15th, 2010 12:40 AM 
frac(e^n)  Yegreg  Number Theory  1  December 3rd, 2007 07:33 PM 