| Exam Board | CAIE |
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| Module | P3 (Pure Mathematics 3) |
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| Year | 2018 |
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| Session | November |
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| Topic | Hyperbolic functions |
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4 Showing all necessary working, solve the equation
$$\frac { \mathrm { e } ^ { x } + \mathrm { e } ^ { - x } } { \mathrm { e } ^ { x } + 1 } = 4$$
giving your answer correct to 3 decimal places.