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Join Professor Zhang Xiu as he continues his comprehensive series on calculus, this time tackling the crucial topic of maxima and minima. In this captivating lesson, he masterfully employs the 'old big method' to find the extreme values of functions, a skill indispensable for students aiming to excel in mathematics. With his unique ability to simplify complex mathematical concepts, Professor Zhang Xiu ensures that both beginners and experienced students can follow along and reap the benefits of his expert guidance.