Multiply. Leave the answer in trigonometric form. 
Definitions:
Public Good
A good that is non-excludable and non-rivalrous, meaning it is accessible to all and one individual's use does not diminish its availability to others.
Preferences
Individual choices or prioritizations that indicate the degree of personal satisfaction or value someone derives from various options.
Free-Rider Problem
A situation in which individuals consume a resource or service without contributing to its cost, commonly occurring in the provision of public goods.
Noise Pollution
Unwanted or harmful outdoor sound created by human activities, such as transportation, industrial processes, and construction.
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