Using the power rule of logarithms: $\log_a(x^n)=n\cdot\log_a(x)$
Applying the product rule for logarithms: $\log_b\left(MN\right)=\log_b\left(M\right)+\log_b\left(N\right)$
Multiply the single term $\frac{1}{2}$ by each term of the polynomial $\left(\ln\left(a\right)+\ln\left(b\right)\right)$
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