Integral lnx2 1

Answer 1

If you mean integral ln(x2+1)dx, it is 2tan-1(x)+x[ln(x2+1)-2]. To find this and other integrals, go to

http://integrals.wolfram.com/index.jsp?expr=ln(x^2%2B1)&random=false

It can solve nearly every integral I've encountered.