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Share/Save/Bookmark Login/ Register to Bookmark Topic : "Summation" Started by theprophet

theprophet

#1 Posted 7:28pm 17-03-09  

Summation

This is a repost. The last time I posted this one it got buried somewhere

Find [im]http://codecogs.izyba.com/gif.latex?%5Csum_%7Br%3D1%7D%5En%20%5Ctan%20%5E%7B-1%7D%20%5Cfrac%7B2r%7D%7B2r%5E4+1%7D[/im]


   

Mani Pal Singh

#2 Posted 7:30pm 17-03-09  

Re: Summation

SIR YEH TO KUCHH IIT WAALE QUES JAISE LAG RAHA RAHA HAI
ITS A VERY GOOD 1
SO LETS THINK[12][12][12]
There are two things you should never try to prove ...... the impossible and the obvious ;)    

Anirudh

#3 Posted 7:38pm 17-03-09  

Re: Summation

Nice opportunity to ask something......how to convert summation to integral??

Do the 1 and n in this question become the lower and upper limits??

and does the tan[p]-1[/p].... become the function to integrate??
I'm back    

tapanmast

#4 Posted 7:39pm 17-03-09  

Re: Summation

NO!!!!!!1 NEVER
   

Subash

#5 Posted 7:40pm 17-03-09  

Re: Summation

@anirudh that can be done only when n→∞

this cannot be used here

here i think separate the term inside tan[p]-1[/p]
All have wishes,many have dreams, some have ideas, few have plans  Edited on 7:43pm 17-03-09    

theprophet

#6 Posted 7:41pm 17-03-09  

Re: Summation

For doing that you must be able to convert the summand to the form

[im]http://codecogs.izyba.com/gif.latex?%5Clim_%7Bn%20%5Crightarrow%20%5Cinfty%7D%20%5Csum_%7Bk%3D1%7D%5En%20%5Cfrac%7B1%7D%7Bn%7D%20f%5Cleft%28%5Cfrac%7Bk%7D%7Bn%7D%5Cright%29[/im]


See if that is possible here
   

Anirudh

#7 Posted 7:44pm 17-03-09  

Re: Summation

tapan, u sound as if u are having a heart attack!!!
I'm back    

Akand

#8 Posted 7:45pm 17-03-09  

Re: Summation

wel i think we shud convert it into d form tan[p]-1[/p]A-tan[p]-1[/p]B.....and all will be cancelled except sum terms and it will be easy to calculate........BUT IM NOT GETTIN IT
IITians are considered to be the smartest ppl on this planet EARTH.........and wat puzzles me is how d heck did I became ONE???    

Mani Pal Singh

#9 Posted 7:46pm 17-03-09  

Re: Summation

ruk
chal main bhi aa gaya[4]
waise i thought like u akand
There are two things you should never try to prove ...... the impossible and the obvious ;)    

deepanshu001

#10 Posted 7:46pm 17-03-09  

Re: Summation

ans...

tan(inverse)(2n^2+2n)

   

Akand

#11 Posted 7:47pm 17-03-09  

Re: Summation

wel manipal thts a standard method hehehe [3][3][3]
IITians are considered to be the smartest ppl on this planet EARTH.........and wat puzzles me is how d heck did I became ONE???  Edited on 7:47pm 17-03-09    

theprophet

#12 Posted 7:50pm 17-03-09  

Re: Summation

deepansh - answer is close. maybe there is a typo in your post
   

Nishant

#13 Posted 7:56pm 17-03-09  

Re: Summation

I think this question was the first time i realised how good Prophet sir actually is :)

The proof i remember was so over the top (of my head) that i realised that I wud not have able to think the logic myself. :)

btw this is not even close to his best ;)
-when spring comes, it melts the snow one flake at a time…    

tapanmast

#14 Posted 7:58pm 17-03-09  

Re: Summation

ANS : tan[p]-1[/p](2n[p]2[/p] + 2n + 1) - Π/4
   

tapanmast

#15 Posted 8:00pm 17-03-09  

Re: Summation

MY MAETHOD'S MAIN STAY :


[hide]divide n multiply 2

then it can b expressed difference of 2 terms, namely

2r[p]2[/p] + 1 + 2r  &&  2r[p]2[/p] + 1 - 2r

then it gets simpler[/hide]
   

theprophet

#16 Posted 8:03pm 17-03-09  

Re: Summation

wow! that was real fast. I almost spent a whole night wondering what to do! Good Job bro
   

tapanmast

#17 Posted 8:06pm 17-03-09  

Re: Summation

THIS IS A GR8 DAY FOR ME :

GETTING PRAISED FRM "PROPHET SIR" is a real honour!! [1]

thank you Sir
   

theprophet

#18 Posted 8:09pm 17-03-09  

Re: Summation

lets request nishant sir to colour it deep red coz tapan is blushing!!
   

tapanmast

#19 Posted 8:12pm 17-03-09  

Re: Summation

he he [1]
   

deepanshu001

#20 Posted 8:23pm 17-03-09  

Re: Summation

ya i missed out sumthin
   
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