March 25th, 2011, 07:41 AM  #1 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  find the sum
find the sum of this sequence 
March 25th, 2011, 08:23 AM  #2 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: find the sum Start by differentiating both sides. 
March 25th, 2011, 10:14 AM  #3  
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: find the sum Quote:
what does diffirentiation has to do with my sequence?  
March 25th, 2011, 10:42 AM  #4 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: find the sum
ok i get it now thanks buddy 
March 25th, 2011, 12:24 PM  #5 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: find the sum
Using aswoods' helpful suggestion: (1) Differentiating both sides: (2) Subtract (1) from (2): Combine rightside with common denominator and simplify: Multiply through by 2: 
March 25th, 2011, 05:57 PM  #6  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: find the sum Hello, islam! This can be solved algebraically. Quote: [color=beige]. . [/color] [color=beige]. . . . . . . . . . .[/color] [color=beige]. . . . [/color]  
March 25th, 2011, 10:58 PM  #7 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: find the sum
Don't forget the case x=1...

March 25th, 2011, 11:52 PM  #8  
Global Moderator Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4  Re: find the sum Quote:
 
March 26th, 2011, 01:24 AM  #9 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: find the sum
thank u aswoods ,markfl, soroban,chaz i am really grateful for ur help u all r really creative i wish u all great breakthroughs in math, wealth and happiness. 

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