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9. (a) Find the McLaurin series of f (:13) = cosh(:r). (b) Use the above result to show that cosh :1: > 1 + %$2

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9. (a) Find the McLaurin series of f (:13) = cosh(:r). (b) Use the above result to show that cosh :1: > 1 + %$2 for all x. (0) Graph (3053: and 1 + 332/2 to illustrate the above result

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