Find the derivative of the function. 
Definitions:
Coupon
A coupon refers to the annual interest payment received by bondholders, typically expressed as a percentage of the bond's face value.
Semiannually
Refers to an event or action that occurs twice a year, typically every six months.
Yield Curve
A graph that shows the relationship between interest rates and bonds of different maturities, usually interpreted as an indicator of future economic conditions.
Bond Portfolio Manager
An individual or team responsible for making investment decisions about a portfolio of bonds in order to achieve specified investment objectives.
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