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Apply the substitution $u = 3x + 1$ in order to evaluate $\int \frac{3x}{3x + 1} \, dx$.
Mathematics 9709 · AS & A Level · Integration
Integration — practice question
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Complete the substitution fully, including the step $\dfrac{du}{dx}=3$” …
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