Use the substitution u=x4+1u = x^4 + 1u=x4+1 to find ∫122x3(x4+1)2dx\int_1^2 2x^3(x^4 + 1)^2 dx∫122x3(x4+1)2dx.
111 exam-style questions on WJEC A Level Maths 3.7.4 Integration (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.