I'm stuck on b) iii) of this question. I'll show you what i have got so far.
the function f is given by f(x)=
a) express f(x) as a partial fraction.
b) i) Find the first three terms in the expansion of
b) ii) Obtain a similar expansion for
where i am stuck on is b) iii)
Hence, or otherwise, obtain the first three terms in the expansion of f(x) in ascending powers of x