With the help of Hari Kishan's PDF, Rahul began to understand Integral Calculus like never before. He practiced the problems and examples in the book, and slowly but surely, his confidence grew. He started to enjoy solving integrals and began to see the beauty in the subject.

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The PDF covered all the topics that Rahul was struggling with, including basic integration, integration by substitution, integration by parts, and definite integrals. The author also provided numerous practice problems, which helped Rahul to reinforce his understanding of the material.