Find the derivative of 
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Definitions:
Economic Profit
the difference between total revenue and total opportunity costs; a measure of profit beyond the normal return on investment.
Marginal Cost
The addition to total cost from producing one additional unit of a product.
Perfectly Competitive Firm
A perfectly competitive firm operates in a market where there are many buyers and sellers, the product is homogenous, and there is free entry and exit from the market.
Economic Profit
The gap in financial terms between total earnings and all financial burdens, considering both express and tacit costs.
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