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I have this PDF Calculus book.

But the image quality is poor. However, there seems to be a hidden text under the poor quality image. (I can search and mark the textfields). My question is: Do you know anyway in which I can read the hidden text instead of the poor quality image? I would prefer that the text shows in front of the image inside the PDF, so that I can still see figures and graphs. I have Adobe Acrobat Pro.

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