Find the Jacobian of the transformation. 
Definitions:
Salesperson's Oral Promise
A verbal commitment made by a salesperson regarding the quality, function, or warranty of a product or service.
Implied Warranty Of Fitness
An assurance that a product will meet the buyer's specified needs, even though these assurances are not explicitly stated.
Express Warranty
A promise clearly stated by a seller about the condition, functionality, or reliability of a product.
Merchantability
A guarantee that a product will meet reasonable consumer expectations of quality and suitability for use as sold.
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