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The sum mathematical formula in pdf file has been completely blacked out. How to solve it?
Use Secco OCR software, if you can't use it, it will be helpful after downloading-common operation demonstration. I guarantee that all your problems will be solved. Not much to say, but it will certainly be useful. Thank you for your adoption.

Give it to me! ! !

The black box is a picture. If you convert pictures into text, you can use CyberOCR.