Another angle: if the user is in a country with specific copyright exceptions for educational purposes, I should be cautious about making assumptions. Best practice is to encourage legal compliance and provide alternatives. Maybe offer tips on studying integral transforms without the specific book. Recommend chapters from online courses, free textbooks, or video lectures.
I should also consider that "patched" might mean corrected or updated. If there are known errors in the original text, maybe the user wants a version with those fixed. In that case, suggesting contacting the authors or looking for errata published by them could be helpful. Alternatively, pointing the user towards other reputable sources on integral transforms that might have more up-to-date information. integral transforms by goyal and gupta pdf patched
Also, think about the possible confusion. The user might not be aware that modifying a PDF (patching) is problematic, and they might need study materials. Clarifying that they can find legal resources is key. Maybe even suggest citing the Goyal and Gupta book if they have access through a library or institution. Another angle: if the user is in a