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CAL 2Evaluate by using integration by parts
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\[\int\limits_{1}^{3}\sqrt{x} \tan^{-1} (\sqrt{x})dx\]
\[u=\tan^{-1} (\sqrt{x}) , du=1/1+x*(1/2\sqrt{x})\]
\[t=\sqrt{x} so dt=1/2\sqrt{x} than 2dt=1/\sqrt{x}\]
du=1/(x^1/2*(2x+2))
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