mathematics

If $Pe^x = Qe^{-x}$ for all real values of $x$, which one of the following statements is true?

For positive non-zero real variables x and y, if $\ln\left(\frac{x+y}{2}\right) = \frac{1}{2}[\ln (x) + \ln (y)]$ then, the value of $\frac{x}{y} + \frac{y}{x}$ is