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**'s question at Yahoo! Answers: a definite integral whose integrand has an absolute value factor.**

Here is the question:

I have posted a link there to this thread so the OP can view my work.☺ said:How to solve ʃ (-18 to 1) [s│81 - s^2 │] ds?

The 81 - s^2 is inside absolute value signs. I don't know how to do this. Can you show me how?