Find y by referring to the graph of the trigonometric function. 
Definitions:
Equilibrium Price
A price level where the demand for a product matches the supply, ensuring that every buyer finds a seller and vice versa, leading to market stability.
Temporary Surplus
A situation where the supply of a product exceeds its demand for a short period of time.
Usury Laws
Usury laws are regulations governing the amount of interest that can be charged on loans, aimed at preventing exorbitant or unfair interest rates.
Price Ceiling
A government-imposed limit on how high a price can be charged for a product, service, or commodity to protect consumers from rapid price increases.
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