Note to the reader: This post is written to be helpful while adhering to copyright awareness. It explains what "patched" means in this context and directs students toward legitimate solutions.

First, a critical clarification:

What does "Patched PDF" even mean?

In the context of this specific book (S. Chand Publishing), the term "patched" refers to a widespread issue with early scanned copies circulating online.

Google Books: Provides limited previews of the text for quick reference.