Find the differential of the function. 
Definitions:
National Debt
The total amount of money that a country’s government has borrowed, by various means, which it is obligated to pay back.
Sacajawea
A Lemhi Shoshone woman who is known for her help to the Lewis and Clark Expedition in achieving their chartered mission objectives by exploring the Louisiana Territory.
Shoshone
A Native American tribe originally from the western United States, known for their cultural richness and history of resistance.
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