- #1
WarDieS
- 23
- 0
Homework Statement
Hi, i had to solve a some series and i had no problem except for this one
[tex]\sum\frac{6}{4n^2+1}[/tex] from 1 to infinity
The Attempt at a Solution
i've tried to do it by simple fractions didn't work, it's no geometric,hipergeometric, telescopic.
All exercices had "nice" solutions meaning they were round numbers or fractions, so i solved this one with mathematica and gave me an "ugly" solution which is
[tex]\frac{3}{2}\left(-2 + \pi coth (\frac{\pi}{2})\right)[/tex]
So i though maybe is a typo and its actually [tex]\sum\frac{6}{4n^2-1}[/tex] from 1 to infinity, so i did this one by simple fractions and gave me 3, but i still want to learn how to solve the original, i want to know how can be the coth function in the solution!
Thx for the help