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  3. 3 a starting from the definitions of sinhr and coshx...

Question: 3 a starting from the definitions of sinhr and coshx...

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3. (a) Starting from the definitions of sinhr and coshx in terms of exponentials, prove that cosh 2x = 1 + 2 sinh 2x (b) Solve the equation cosh 2x-3 sinh x = 15. giving your answers as exact logarithms

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