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I have this series here

[tex]\sum_{n=1} ^{\infty} \frac{1}{x^2+n^2}[/tex]

I need to show that the Radius of convergens [tex]R = \infty [/tex] and the interval of convergens therefore is [tex](- \infty, \infty) [/tex]

My question is to do this don't I use the ratio-test?

Sincerely Yours

Hummingbird25

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# Homework Help: QUESTION: Interval of Convergens for a series

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