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1. (a) Use the definitions cosh Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "http://localhost:6011/en.wikipedia.org/v1/":): {\displaystyle x = {{frac|1/2))(e<sup>x</sup> + e<sup>-x</sup>}
to show that 
