Posted by albert on Tuesday, May 17, 2011 at 2:25pm.
f '(x) = (e^x + e^-x)/(e^x - e^-x)
= e^-x(e^(2x) + 1)/(e^-x(e^(2x) - 1)
= (e^(2x) + 1)/(e^(2x) -1)
now use the quotient rule to get the second derivative,
let me know what you got.
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