Let 
.
What is the coefficient of 
in the ninth Maclaurin polynomial of 
?
Definitions:
Risk-Free Investment
An investment that is expected to return its original investment value without any loss.
Mean-Variance Criterion
The mean-variance criterion is a method for selecting investments that balance expected return against portfolio variance or risk.
Expected Return
The forecasted profit or loss from an investment over a specific period, often based on historical data or statistical models.
Standard Deviation
A measure of the dispersion or variability of a set of data points from their mean, used in finance to estimate the risk of an investment.
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