17. Hyperbolic Cosine Function The hyperbolic cosine function is defined by e* + e* cosh(x) 2 (a) Sketch the graphs of the functions y = }e* and y = te* on the same axes, and use graphical addition (see Sec- tion 2.7) to sketch the graph of y = cosh(x). (b) Use the definition to show that cosh(-x) = cosh(x). %3D

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