Another one of those limit problems, if it's approaching from the left or right it gives a different result:
Use the definitions of the hyperbolic functions to find the following limit: cosh (4)
And when I do lim x->0 (e^x + e^-x)/ (e^x-e^-x)
I get 2 results

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Sorry its cothx

Interesting. You are correct, the limits from the left and right are not the same.

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