1.Find the domain of the hyperbolic tangent f(x)=(e^x-e^-x)/ (e^x+e^-x) .Prove that this function is onto its co-domain which is the interval (-1, 1). Solve for x to do so, or do it with the graph but explain how the graph works.

Take the previous function and prove that it is one-to-one on its domain. Using this fact, and what youproved, show that f is invertible.