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Mathematics 16 Online
OpenStudy (johnnydicamillo):

Help me finish evaluating this integral

OpenStudy (johnnydicamillo):

Okay I am working on the following \[\int\limits_{}^{}\sin^{-1} x dx\] and I am using integration by parts setting u = arcsin(x) and dv = dx and du = \[\frac{ xdx }{ \sqrt{1^2-x^2} }\] and v = x

OpenStudy (johnnydicamillo):

so now I am left with the following

OpenStudy (johnnydicamillo):

\[s \sin^{-1} x - \int\limits_{}^{}\frac{ x dx }{ \sqrt{1^2 - x^2} }\]

OpenStudy (johnnydicamillo):

that "s" is an "x"

OpenStudy (johnnydicamillo):

now I need help integrating that trig identity on the right. I think its sine

OpenStudy (johnnydicamillo):

would I integrate the right side like this arcsin(x) + c?

OpenStudy (anonymous):

oh no trig identity basic u sub will do try \(u=1-x^2\)

OpenStudy (johnnydicamillo):

okay let me see

OpenStudy (anonymous):

oh wait doh nvm

OpenStudy (anonymous):

your method is correct, just use a u sub

OpenStudy (usukidoll):

|dw:1424041096453:dw|

OpenStudy (usukidoll):

then simple u sub u = 1 - x^2 du = 2x dx 1/2x du = dx

OpenStudy (johnnydicamillo):

wait isn't that a -1/2

OpenStudy (usukidoll):

|dw:1424041192100:dw|

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