| Exam Board | Edexcel |
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| Module | C4 (Core Mathematics 4) |
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| Year | 2007 |
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| Session | June |
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| Topic | Integration by Substitution |
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2. Use the substitution \(u = 2 ^ { x }\) to find the exact value of
$$\int _ { 0 } ^ { 1 } \frac { 2 ^ { x } } { \left( 2 ^ { x } + 1 \right) ^ { 2 } } d x$$