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[tex]\int[/tex][tex]\stackrel{du}{\sqrt{u^{2}-4}}[/tex] = ln(u + sqrt.(u

My answer key makes the jump directly from that integral to that natural log fxn, which would make sense to me if only the "u +" weren't inside the brackets of the ln fxn.

Does anyone know where it comes from?

^{2}-4))My answer key makes the jump directly from that integral to that natural log fxn, which would make sense to me if only the "u +" weren't inside the brackets of the ln fxn.

Does anyone know where it comes from?

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