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Textbook Expert
Textbook ExpertVerified Tutor
11 Nov 2021

Given information

Note that given a function .

Step-by-step explanation

Step 1.

Know that according to Fermat's Theorem: if has a local maximum or minimum at and is differentiable at . If a function has a local maximum or minimum at a point , then its tangent at that point (if it has one) must be a horizontal line, according to this theorem.

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