Use the substitution u=1+2exu = 1 + 2e^xu=1+2ex to find ∫e3x1+2exdx\displaystyle \int \frac{e^{3x}}{1 + 2e^x} dx∫1+2exe3xdx.
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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.