_:na31059562ee947cbbb1574a8c4738733xb1
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://es.symbolab.com/solver/step-by-step/%5Cint_%7B%20-1%7D%5E%7B1%7D%5Cfrac%7Bx%7D%7B%28x%5E%7B2%7D%2B1%29%5E%7B2%7D%7Ddx>