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## Homework Statement

How can i find if the following series is convergent or divergent using the

__INTEGRAL TEST__?

sigma (n=1 to infinity)= n/(n^4+1)

## Homework Equations

## The Attempt at a Solution

The answer says that the initial step involves changing it to: 1/2(2x)/(1+(x^2)^2)..but why is that?