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Mathematics 13 Online
OpenStudy (anonymous):

Integrate by parts \[\int\limits_{}^{} \arccos(x)dx = (\arccos(x)x^{2}/2) - \int\limits_{}^{} x^{2}/\sqrt{1-x^{2}} dx\] What is the next step?

OpenStudy (anonymous):

I was told I should suppose x = sin u => dx = cos u du but why?

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