Find the derivative of the function and simplify your answer by using the trigonometric identities 
Definitions:
Demand P
The desire and ability of consumers to purchase a good or service at a particular price, often represented as a demand curve.
Consumer Surplus
The discrepancy in the total money consumers are willing to invest in a good or service compared to what they really pay.
Market Demand Curve
A graphical representation showing the relationship between the price of a good and the total quantity demanded by all consumers in the market.
Magazine Circulation
The total number of copies of a magazine that are distributed to subscribers and retailers within a specific period.
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