http://tutorial.math.lamar.edu/Classes/CalcII/TrigSubstitutions.aspx(adsbygoogle = window.adsbygoogle || []).push({});

In example one, the author drops the absolute value bars and makes the following statement:

"Without limits we won’t be able to determine if ##\tan{\theta}## is positive or negative, however, we will need to eliminate them in order to do the integral. Therefore, since we are doing an indefinite integral we will assume that ##\tan{\theta}## will be positive and so we can drop the absolute value bars."

Why should we assume that ##\tan{\theta}## will be positive?

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# Trigonometric substitutions

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