I actually somehow got really curious about the calculus book your post which turns out to be from this guy https://en.wikipedia.org/wiki/Aurelio_Baldor In the Spanish speaking part of the world the standard books are quite different :3
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Hi friend @mathowl, it's my old Balbor algebra book I implemented it in my college algebra classes over 20 years ago. Greetings and thanks for your visit to my post.