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![3.4 First Derivative Test [Example 2] (Part 2)](https://i.ytimg.com/vi/HVHBcmBDTgQ/maxresdefault.jpg)
![3.4 First Derivative Test [Example 2] (Part 1)](https://i.ytimg.com/vi/sLYjWjfIwEs/maxresdefault.jpg)
![3.4 First Derivative Test [Example 1]](https://i.ytimg.com/vi/6D6bNBNLsX4/maxresdefault.jpg)
