
#1
Mar111, 02:28 PM

P: 42

I'm sure it doesn't, but how do I find out?
[tex]\sum^{infinity}_{n=1} arctan (n)[/tex] I thought about using the integral test, but it's not decreasing. Any hints? Could I somehow use proof by induction to show that its an increasing function? 



#2
Mar111, 03:11 PM

Mentor
P: 16,545

What is [tex]\lim_{n\rightarrow +\infty}{arctan(n)}[/tex]?? Does this tell you something about convergence?




#3
Mar111, 03:28 PM

P: 42

pi/2, so by the test for divergence it must diverge! Ohh




#4
Mar111, 03:33 PM

Mentor
P: 16,545

Does the series arctan n converge?
Correct!! A good advice: Always apply the test for divergence first!!




#5
Mar111, 03:34 PM

P: 42

Thanks :)




#6
Mar111, 08:41 PM

Mentor
P: 20,962




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