Find the unit vectors that are parallel to the tangent line to the curve 
at the point 
Definitions:
World Trade
The exchange of goods and services across international borders, influenced by agreements, tariffs, and global economic policies.
Largest Importer
The country or entity that brings the highest volume of goods into its territory from other countries.
Gray Market
The trade of goods through distribution channels that are legal but unintended by the original manufacturer.
Parallel Exporting
The practice of unofficially distributing products through channels that are not authorized by the original manufacturer, often across national borders.
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