What are the antiderivites of

Question

x/ (x^2 (squareroot of x^4-1))

and

1/ (1+(x^2/4)) no idea :{

Answer 1

I use this page instead of looking integrals up on tables

http://integrals.wolfram.com/index.jsp?expr=x%2F%28x%5E2%28x%5E4-1%29%5E%281%2F2%29%29&random=false

here is the second one

http://integrals.wolfram.com/index.jsp?expr=1%2F+%281%2B%28x%5E2%2F4%29%29&random=false