Find the following partial derivative: fxy if 
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Definitions:
Marginal Revenue
The extra revenue obtained through the sale of an additional unit of a product or service.
Producing Unit
A division or component of a business that is responsible for the creation of specific products or services.
Marginal Cost
The additional cost incurred by producing one more unit of a product or service.
Producing Unit
A part of a company or a machine that is responsible for manufacturing or creating goods.
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