lim_(x->-oo) cschx Find the limit

Given,
lim_(x->-oo) cschx
= lim_(x->-oo) (2/(e^x -e^(-x)))
as x -> to negative infinity e^x -> 0 and e^-x tends to negative infinity
so,
lim_(x->-oo) (2/(e^x -e^(-x))) = lim_(x->-oo) (2/(0 -(-oo))) = 0

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