# Inverse of a function

• I
Hi,
What is the inverse of f(x)= e^x + e^-x +1?

Try solving $$e^x+e^{-x}+1=y.$$
Convert problem into a quadratic equation by $u=e^x,\ u^2+1+u(1-y)=0$. Get u as a function of y, then x=ln(u).