Can anyone help me with the following integrals (integrate by(adsbygoogle = window.adsbygoogle || []).push({}); substitution)?

[tex]

\int{\frac{dx}{\sqrt{x^2 - 4}}}

[/tex]

[tex]

\int{\frac{dx}{\sqrt{x^2 + 4}}}

[/tex]

I have no idea whatsoever on how to do it.

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# Integration by Substituion

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