(a) Use the definitions of hyperbolic functions in terms of exponentials to prove that 8 cosh'x cosh 4x+ pcosh 2x + q where p and q are constants to be determined. (b) Hence, or otherwise, solve the equation cosh 4x – 17 cosh 2.x + 9 = 0 giving your answers in exact simplified form in terms of natural logarithms.

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