Find the differential of the function. 
Definitions:
Bonds Payable
Long-term liabilities representing the amount owed by an entity to bondholders.
Face Value
The nominal or dollar value printed on a bond or stock, representing the amount due at maturity for a bond or the value assigned to a stock share at issue.
Effective Interest Rate Method
The effective interest rate method is a technique for calculating the actual interest rate for a loan or financial product over time, considering the effects of compounding.
Interest Expense
The cost incurred by an entity for borrowed funds, often reflected in the payment of interest on loans or debt.
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