Use the substitution u=x2+13u = x^2 + 13u=x2+13 to find ∫2xx2+13dx\displaystyle \int \frac{2x}{x^2 + 13} dx∫x2+132xdx
221 exam-style questions on WJEC A Level Maths 3.7 Integration (A-level only), covering 3.7.1 Integration (A-level only), 3.7.2 Integration (A-level only), 3.7.3 Integration (A-level only), 3.7.4 Integration (A-level only), 3.7.5 Integration (A-level only), and 3.7.6 Integration (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.