5 The diagram shows part of the curve \(y = 5 \cosh x + 3 \sinh x\).
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- Solve the equation \(5 \cosh x + 3 \sinh x = 4\) giving your solution in exact form.
- In this question you must show detailed reasoning.
Find \(\int _ { - 1 } ^ { 1 } ( 5 \cosh x + 3 \sinh x ) \mathrm { d } x\) giving your answer in the form \(a \mathrm { e } + \frac { b } { \mathrm { e } }\) where \(a\) and \(b\) are integers to be determined.