Question

find dy/dx of (e^x-e^-x)/(e^x+e^-x)

Answer 1

(e^x-e^-x)/(e^x+e^-x) = tanh(x)

so d/dx tanh(x) = sech^2(x)

Answer 2

http://www.wolframalpha.com/input/?i=derivative+%28e^x-e^%28-x%29%29%2F%28e^x%2Be^%28-x%29%29

Answer 3

btw, these are hyperbola trig, not trig itself