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Order the working rule for absolute maxima and minima

Exercise and reference answers

Steps
  1. Find every critical point of f inside the interval
  2. Take the two endpoints of the interval as well
  3. Evaluate f at all of those points
  4. The largest value found is the absolute maximum
  5. The smallest value found is the absolute minimum

Explanation

Your syllabus gives this as a four-step rule, and the step people skip is taking the endpoints. Source: syllabus Maths Part I, Ch 6 Application of Derivatives.
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