Expand (1+2x)−2(1+2x)^{-2}(1+2x)−2 in ascending powers of x x\,x up to and including x3x^3x3
Write down the range of values of x x\,x for which the expansion is valid.
Use your expansion to find the expansion of 1−x(1+2x)2\displaystyle \frac{1-x}{(1+2x)^2}(1+2x)21−x up to and including x3x^3x3
67 exam-style questions on WJEC A Level Maths 3.4.1 Sequences and Series (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.