Question
Answer Key
Worked Solution
9758/2020/P1/Q07
\section{Do not use a calculator in answering this question.}
It is given that $f(x)=2-\sin 4 x$.
(i) Find $\int f(x) d x$
[1]
(ii) Find the exact value, in terms of $\pi$, of $\int_{0}^{\frac{1}{2} \pi} x \mathrm{f}(x) \mathrm{d} x$.
[4]
(iii) Find the exact value, in terms of $\pi$, of $\int_{0}^{\frac{1}{2} \pi}(f(x))^{2} \mathrm{~d} x$.
[4]