Find the differential of the function. 
Definitions:
Negatively Correlated
Describes two variables that move in opposite directions; as one increases, the other tends to decrease.
Variance
A measure of the dispersion of a set of data points around their mean value, indicating how spread out the data points are.
Portfolio
A collection of investments held by an individual or an institution.
Expected Rate
A predicted rate of return or outcome based on certain assumptions or historical data.
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