Over the Counter (OTC) drugs are drugs that can be bought freely in pharmacies (drugstores) and supermarkets - drugs like paracetamol (acetaminophen) or aspirin, that do not have to be prescribed by a medical practitioner.

The domain of a function is the set of all possible input values (often the "x" variable), which produce a valid output from a particular function; the set of all real numbers for which a function is mathematically defined.

Added 5/1/2014 5:26:04 AM

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