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Ariel1996

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Edstrayer

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tianyanling

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2Â¥2016-01-07 21:49:14
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4Â¥2016-01-08 08:08:02
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Ariel1996

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ÒýÓûØÌû:
3Â¥: Originally posted by Edstrayer at 2016-01-08 01:09:09
\int_0^a\frac{dx}{x+\sqrt{a^2-x^2}}{x=a\sin y \atop ====}\int_0^{\frac{\pi}{2}}\frac{\cos ydy}{\sin y+\cos y}=\frac{\pi}{4}

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