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What is high school mathematics, derivative, extreme value (big or small), maximum value (big or small) and extreme point?
Extreme value (large and small) generally refers to the value obtained by bringing X into fx when the derivative value is equal to 0.

The maximum (large and small) values are generally the function values at the endpoints. Compared with extreme values (large and small), the maximum value is the maximum value and the minimum value is the minimum value.

Extreme point, not a point, not a coordinate, is generally the value of x when the derivative value is equal to 0.