| Exam Board | AQA |
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| Module | Paper 3 (Paper 3) |
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| Year | 2021 |
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| Session | June |
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| Marks | 6 |
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| Topic | Integration by Parts |
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8 Given that
$$\int _ { \frac { \pi } { 4 } } ^ { \frac { \pi } { 3 } } x \cos x d x = a \pi + b$$
find the exact value of \(a\) and the exact value of \(b\).
Fully justify your answer.
[0pt]
[6 marks]