(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

2. Relevant equations

from the identities found on the internet:

[tex]cos(x)=\frac{(e^{ix}+e^{-ix})}{2}[/tex]

and

[tex]cosh(x)=\frac{(e^{x}+e^{-x})}{2}[/tex]

3. The attempt at a solution

Assuming for the definition of cosh(x), if we take x as being equal to (ix), then surely this shows that cosh(x)=cos(x)? Can someone explain why this is wrong please? because i can't see it

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# Cos(x) = cosh(x)?

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