| Exam Board | CAIE |
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| Module | P3 (Pure Mathematics 3) |
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| Year | 2021 |
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| Session | November |
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| Topic | Integration by Substitution |
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4 Using the substitution \(u = \sqrt { x }\), find the exact value of
$$\int _ { 3 } ^ { \infty } \frac { 1 } { ( x + 1 ) \sqrt { x } } \mathrm {~d} x$$