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The hyperbolic cosine function, cosh x = (1/2) (e^x + e^-x). Find the Taylor series representation...

The hyperbolic cosine function, cosh x = (1/2) (e^x + e^-x). Find the Taylor series representation for cosh x centered at x=0 by using the well known Taylor series expansion of e^x. What is the radius of convergence of the Taylor Expansion?

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