I just had a quiz and I did not know how to do this question even though it looked so familiar.
Is the improper integral, from 0 to infinity,
convergent or divergent?
I tried using comparison theorem but it didn't work out.
And then I just tried solving the integral by substitution as in u=arctan(t) and du=1/1+t^2 dt but it didn't cancel out!
Please help! Thanks in advance!