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does anybody know how to derive this integral???

[tex] \int \frac{dx}_{\sqrt{x^2 + a^2}} [/tex] [tex] = ln(x+ \sqrt{x^2 + a^2}) [/tex]

[tex] \int \frac{dx}_{\sqrt{x^2 + a^2}} [/tex] [tex] = ln(x+ \sqrt{x^2 + a^2}) [/tex]

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