2-year integral

Yes! This integral took me 2 years to figure out! Of course, I didn't just do this integral without doing anything else. I intensively spent several days 2 years ago on it and gave up. One year ago, I tried it ago and still failed. However, this integral is strongly related to my research. I borrowed its result from another research paper. If it is wrong, all of my research work should be modified, and some of them are even going to be useless. Therefore, I spent some time on it again these days. Excitingly, I finally figured it out!
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