...a Function
Theorem 2 says that if a function has a first derivative at an interior point where there is a local extremum, then the derivative must equal zero at that point. It does not say that every point where the first derivative equals zero must be a local extremum. Because of Theorem 2, on... https://education.ti.com/en/product-resources/t3-free-courses/calculus84-online/mod13/mod13-lesson1
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