Find the second-order partial derivatives of the given function. Show that the mixed partial derivatives 
and 
are equal. 
Definitions:
Centimetres
A unit of length in the metric system, equal to one hundredth of a metre.
Ages
The length of time that a person or thing has existed.
Track and Field Team
A group of athletes who participate in track and field events, which may include running races, jumping, and throwing disciplines.
Case Prices
The cost of a product or commodity when purchased in bulk quantities for each case.
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