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In this insightful calculus tutorial, Zhang Xu, a seasoned educator, delves into the intricacies of the variable transform method, the first of four essential calculus techniques. With his patient, step-by-step guidance, he guides students through the process, using a thoughtfully chosen problem to illustrate the method's application. Zhang Xu's engaging teaching style and deep understanding of the subject make calculus accessible and intriguing for students of all levels.