If replace the (1-x) by (a-x) in the Beta integral what the result will be?

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    Beta Integral
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Replacing the term (1-x) in the Beta integral with (1-a) where a>1 significantly alters the integral's structure. The discussion highlights the challenge in finding a suitable substitution to convert the new integral back to a Beta form. Participants assert that the result will likely involve Gamma functions, but in a modified format, specifically suggesting the use of the Incomplete Beta function instead of the standard Beta function.

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Once (1-x)^n-1 is replaced by (1-a)^n-1 where a>1, the form of the integral changed drastically (I can't find a proper substitution in order to transform the new integral to Beta), does anyone know how to compute the new integral then? (I presume the result will still involve Gamma functions, but in another form?)
 

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Incomplete Beta function instead of the Beta function :
 

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