Question

Hi! How might I simplify "(e^u +e^-u)^2 - (e^u -e^-u)^2 /(e^u +e^-u)^2"? :)

Answer 1

:)

Answer 2

(a+b)^2 - (a-b)^2 = 4ab ?

Answer 3

hmm

Answer 4

ok, got it

Answer 5

that will be (2e^u +2e^-u) and so on