Use the substitution u=1+exu = 1 + e^xu=1+ex to find ∫e4x1+exdx\displaystyle \int \frac{e^{4x}}{1 + e^x} dx∫1+exe4xdx.
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Markscheme
1.9.28 Integration by substitution (other cases) (A-level only) Questions
59 exam-style questions on OCR (MEI) A Level Maths 1.9.28 Integration by substitution (other cases) (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.