Klaro
\(\frac{n-2}{n-1}\cdot (\sigma^2+\mu^2)-\frac{n-1}{n-1}\cdot\sigma^2 =\frac{n-2}{n-1}\cdot \sigma^2 -\frac{n-1}{n-1}\cdot\sigma^2 +\frac{n-2}{n-1}\cdot \mu^2 =\left(\frac{n-2}{n-1}-\frac{n-1}{n-1}\right)\cdot\sigma^2 +\frac{n-2}{n-1}\cdot \mu^2 \)
\(\qquad=\frac{n-2 - (n-1)}{n-1}\cdot \sigma^2 +\frac{n-2}{n-1}\cdot \mu^2 =\frac{n-2 - n+1}{n-1}\cdot \sigma^2 +\frac{n-2}{n-1}\cdot \mu^2=\frac{-1}{n-1}\cdot \sigma^2 +\frac{n-2}{n-1}\cdot \mu^2 \)
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