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Delve into the captivating world of calculus with Professor Zhang as he expertly navigates you through the process of finding extreme values using derivatives. You'll be amazed at how these mathematical principles can help you understand the real world, from economics to physics. With a wealth of examples and a passion for teaching, Professor Zhang makes learning calculus an enjoyable experience. So, whether you're a student seeking to enhance your understanding or a curious mind eager to learn, this lesson is not to be missed.