The nth term for a sequence is the square root of [n/ (n^4 + 1)]
Investigate whether it is convergence or divergence.
Ratio test and integral test
The Attempt at a Solution
Ratio test will fail for this question, since no conclusion can be drawn if the ratio is 1. So I have to use integral test. I tried integrating the function using integration by part, bu that doesn't work. Trigonometric substitution fail as well. Any idea how to integrate the function?