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Expand $\sqrt{\left(\frac{1 - x}{1 + x}\right)}$ as a series in ascending powers of $x$, including terms up to $x^2$, and simplify the coefficients.
Mathematics 9709 · AS & A Level · Algebra
Algebra — practice question
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “State an unsimplified correct term in $x$ or $x^2$ from either $\sqrt{1-x}$ or $(1+x)^{-\frac{1}{2}}$” …
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