| Exam Board | OCR |
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| Module | Further Pure Core 2 (Further Pure Core 2) |
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| Year | 2018 |
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| Session | December |
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| Topic | Hyperbolic functions |
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3 In this question you must show detailed reasoning.
Solve the equation \(2 \cosh ^ { 2 } x + 5 \sinh x - 5 = 0\) giving each answer in the form \(\ln ( p + q \sqrt { r } )\) where \(p\) and \(q\) are rational numbers, and \(r\) is an integer, whose values are to be determined.