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exponential coshx expand

The expansion of cosh(x) is: 1 + x^2/2! + x^4/4! + x^6/6! + ...


exp(cosh(x) =

exp(1 + x^2/2! + x^4/4! + x^6/6! + ...) =    (now use x^(a+b) = x^a.x^b),

exp(1).exp(x^2/2!).exp(x^4/4!).exp(x^6/6!). ...

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