Find the first partial derivatives of the function 
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Definitions:
Reservation Price
The absolute highest price that a buyer is prepared to pay for a product or service.
English Auction
A type of auction in which prices start low and bid up by participants until no higher bids are offered.
Willingness To Pay
The maximum amount an individual is prepared to spend to acquire a good or service or avoid something undesirable.
Expected Revenue
The average amount of money a company anticipates receiving over a specific period based on probable sales or services provided.
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