Find the derivative of the function. 
Definitions:
Present Value
The value today of a sum of money expected in the future or a series of financial inflows, calculated with a specified rate of interest.
Future Value
An estimation of a current asset's value on a future date, determined by projecting its growth rate over time.
Mortgage Rate
The interest rate charged on a mortgage loan, determining the cost of borrowing for purchasing property.
APR
Annual Percentage Rate, the annual rate of interest without taking into account the compounding of interest within that year.
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