If we see the form [itex]\sqrt { { a }^{ 2 }-{ x }^{ 2 } }[/itex], we always set [itex]x=asinθ[/itex](adsbygoogle = window.adsbygoogle || []).push({});

How do we know that it will work in advance? Just trial & error?

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# Trigonometric Inverse Substitution: How do we know which substitutions to use?

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