[itex] \frac{d}{d \sigma ^2} [log(\sigma ^ 2) - \frac{1}{\sigma ^ 2}] [/itex](adsbygoogle = window.adsbygoogle || []).push({});

I think the first part is

[itex] \frac{1}{\sigma ^ 2} [/itex]

but pretty clueless after that. I also want to take the second derivative.

Any help or a reference would be great.

Thanks!

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# Square in denominator of derivative

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