Specifically when doing integration problems. I know the indef integral of cosx/sinx+1 is ln(sinx+1) + C, but absvalue is not required here. I think it's because the sine fn must be >= 0 or it's undefined? What about in other cases, is there a general rule to know when to use absvalue?(adsbygoogle = window.adsbygoogle || []).push({});

Thanks

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# What are the rules to know when to use absolute value?

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