CAPE Pure Mathematics Unit 1 · 2008 (Rest of Region) · Paper 1 · Question Q37

The first derivative of -\frac{1}{x^2 - 1} is

1. (A)-\frac{x}{2(x^2 - 1)}
2. (B)\frac{x}{2(x^2 - 1)}
3. (C)\frac{2x}{(x^2 - 1)^2}
4. (D)-\frac{2x}{(x^2 - 1)^2}