1. The problem statement, all variables and given/known data I'm trying to find the series expansion of ln[x + (1+x2)1/2]. 2. Relevant equations 3. The attempt at a solution I managed to find the MacLaurin series expansion by using the definition of MacLaurin series, which means I had to derive the function multiple times. However, I'd like to know if there's another way I could've used to find the series, which would be another mathematical trick I'd add into my arsenal.