Use the substitution u=x2+4u = x^2 + 4u=x2+4 to find ∫2xx2+4dx\displaystyle \int \frac{2x}{x^2 + 4} dx∫x2+42xdx
95 exam-style questions on OCR A Level Maths 1.8.8 Integration by substitution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.