Find the unit tangent vector for the curve given by 
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Definitions:
Aggregate Demand
The entire market demand for goods and services in an economic setting, priced collectively at a given level during a specified period.
Aggregate Supply
The aggregate amount of commodities and services scheduled for sale by businesses within a national economic framework during a designated timeframe.
Aggregate Demand Curve
A graphical representation showing the total amount of goods and services demanded across all levels of an economy at various price levels.
Interest Rate
The interest rate a borrower incurs for using money loaned from a lender.
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