Find the exact value of the given expression using a sum or difference formula. 
Definitions:
Demand Curve
A graphical representation showing the relationship between the price of a good and the quantity demanded.
Product Differentiation
The process by which companies distinguish their products or services from others in the market to attract a specific target audience.
Perfect Competition
A market structure characterized by a large number of small firms, identical products, free entry and exit, and perfect information, leading to efficient outcomes.
Peak Efficiency
The state of operating at maximum productivity with minimal waste and expense.
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