Halls of Ivy -
I think you missed out the spuare root in my equation when differentiating. Any chance you could show me the working again with the square root in there? ie the differentiation etc.
Sorry, I left a few points out...
I need to evaluate the taylor series of that equation to second order about x=0. Then I need to compare f(0.1) with my taylor series approximation.
Does that make it simpler?
Thanks a lot for your help.