Find the Jacobian of the transformation. 
Definitions:
Equivalent Ratio
A ratio that has the same value when compared to another ratio, despite possibly having different terms.
Ratio
A relationship between two quantities expressed as the quotient of one divided by the other.
Equivalent Ratio
A way to express the same relationship or proportion between two quantities, although the numbers involved may differ.
Equivalent Ratio
A proportional relationship between two quantities showing how many times one value contains or is contained within the other.
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