Find the exact value of the given expression using a sum or difference formula. 
Definitions:
Hallucinogens
Substances that cause alterations in perception, thought, or mood, leading to hallucinations that are not based on reality.
Proposition Not-p
A statement or proposition that asserts the negation of another proposition.
Compound Proposition
A statement formed by combining two or more propositions using logical connectives.
Whales
Large marine mammals known for their intelligence and complex social behaviors, belonging to the order Cetacea.
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