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1. (a) Use the definitions cosh Failed to parse (syntax error): {\displaystyle x = {{frac|1/2))(e<sup>x</sup> + e<sup>-x</sup>} to show that
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1. (a) Use the definitions cosh Failed to parse (syntax error): {\displaystyle x = {{frac|1/2))(e<sup>x</sup> + e<sup>-x</sup>}
to show that 