Power Series

Expand the function \cosh{x}, where \cosh{x}=\displaystyle \frac{e^{x}+e^{-x}}{2}.

Source: Porter, R.I. (1963). Further Elementary Analysis (2nd ed.). London: G. Bell & Sons. (Examples 3a, Question 6(ii), p. 39)

Author: ascklee

Dr. Lee teaches at the Wee Kim Wee School of Communication and Information at the Nanyang Technological University in Singapore. He founded The Mathematics Digital Library in 2013.

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