199799
If for x = a the polynomial takes on a relative maximum or minimum value , then a is a root of the equation This definition is a modification of Fermat 's theorem in the form that if ƒ ( a ) is a relative maximum or minimum value of a polynomial ƒ ( x ) , then ƒ ' ( a ) = 0 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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