(i)[3]
Determine the exact value of $f'(\frac{1}{9}\pi)$.
(ii)[3]
Find $\int f(x)\,dx$.
Mathematics 9709 · AS & A Level · Differentiation
Differentiation — practice question
Given that $f(x) = 4\cos^2 3x$.
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This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A derivative in the form $k\cos 3x\sin 3x$, for some constant $k$.” …
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