Differentiate w.r.t. σ
\frac{\sigma ^{2}}{2}
Evaluate
\frac{\sigma ^{3}}{6}
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3\times \frac{1}{6}\sigma ^{3-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{1}{2}\sigma ^{3-1}
Multiply 3 times \frac{1}{6}.
\frac{1}{2}\sigma ^{2}
Subtract 1 from 3.
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