Monday, 12 February 2018

calculus - Determining whether the series: suminftyn=1tanleft(frac1nright) converges



I was tasked with determining whether the following series:



n=1tan(1n)



converges.




I tried employing the integral test which failed and produced incalculable integrals. Other methods didn't prove effective also. I was suggested that the Maclauren series might be of use here, but I'm not sure how to employ it.


Answer



Or by limit comparison test with 1n since by standard limit for x0tanxx1 and then



tan(1n)1n1


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