1. The problem statement, all variables and given/known data 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) 2. Relevant equations 3. 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?