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yy284061737(Edstrayer´ú·¢): ½ð±Ò+15, Èí¼þÇó½â 2019-10-17 10:28:55
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2Â¥: Originally posted by zyh700600 at 2019-10-09 11:29:24
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   \frac{1}{2} \left(\left(3 b^2-1\right) r^2 \log \left(\sqrt{-2 b r x+r^2+x^2}-b r+x\right)+(3 b r+x) \sqrt{-2 b r x+r^2+x^2}\right)  ...

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