The helix 
intersects the curve 
at the point 
. Find the angle of intersection.
Definitions:
Standard Deviation
A statistical measure that quantifies the variation or dispersion of a set of data points or investment returns.
Arithmetic Return
The simple average of a series of periodic returns of an investment.
Investment
The action of allocating resources, usually money, with the expectation of generating an income or profit.
Population
The total number of individuals within a specific area or of a particular species or group.
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