If f(x)=ex−e−xf(x) = e^x - e^{-x}f(x)=ex−e−x, find the inverse function f−1(x)f^{-1}(x)f−1(x).
ln(x+x2+1)\ln(x + \sqrt{x^2+1})ln(x+x2+1)
ln(x+x2+42)\ln(\frac{x + \sqrt{x^2+4}}{2})ln(2x+x2+4)
ln(x2+1)\ln(x^2 + 1)ln(x2+1)
12ln(x+1)\frac{1}{2}\ln(x+1)21ln(x+1)