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## Homework Statement

integral of 1/sqrt(9-x^2)

from 0 to 3

## Homework Equations

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## The Attempt at a Solution

I integrate it correct to arcsin(x/3) from 0 to 3

Get the correct anwser of pi/2.

But there is another question, At which value of x in the integration region [0,3] does special care need to be taken with the integration? I understand at some point it goes from negatie to positive, but i tried 0,3,pi/2,pi.. none worked.. anyhelp?