Integral of 1/sqrt (x^2 - a^2). Plus integrals of 1/sqrt(x^2-1) and 1/sqrt(x^2-a)

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Integration formulas for Integrals of 1/sqrt (x2 - a2), 1/sqrt(x2-1) and 1/sqrt(x2-a). Here a is positive.
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Aha.. -ln(a) is included in the new C
thank you

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