Write the given expression as the cosine of an angle. 
Definitions:
Nonattainment Area
A geographical area that does not meet federally established ambient air quality standards.
Plastics Factory
A manufacturing facility where plastic materials are processed and shaped into products.
Emission Rates
The quantity of pollutants released into the atmosphere by a specific source over a given period.
Innocent Landowner
A property owner who is not responsible for any environmental damage caused by previous owners.
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