Which expression is equivalent to ln(x)+ln(y)−2ln(z)\ln(x) + \ln(y) - 2\ln(z)ln(x)+ln(y)−2ln(z)?
\ln(\frac{x+y}{z^2})
\ln(\frac{xy}{z^2})
\ln(xy - z^2)
\frac{\ln(x)\ln(y)}{(\ln z)^2}