Find the exact value of the given expression using a sum or difference formula. 
Definitions:
Proposition
A statement or assertion that expresses a judgment or opinion, which can be either true or false.
Statement
A sentence or expression that can be classified as either true or false.
Linguistic Expression
A unit of speech or writing that communicates a thought or intention.
Proposition
A statement expressing a judgment or opinion that can be either true or false.
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