Find the length of the curve described by the vector function 
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Definitions:
Marginal Cost
The cost of producing one additional unit of a product, which varies depending on the level of production.
Marginal Revenue
The gain in revenue from disposing of one additional unit of a good or service.
Price Elasticity
An indicator of the responsiveness of the quantity of a product demanded to its price change, represented in terms of percentage variation.
Demand Curve
An illustration depicting the correlation between a product's price and the level of demand from buyers, often characterized by a descending trajectory.
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