 
 
 
Beta takes as argument two reals a,b.
Beta returns the value of the β function at a,b ∈
ℝ, defined by :
| β(x,y)= | ∫ | 
 | tx−1 (1−t)y−1 = | 
 | 
Remarkable values :
| β(1,1)=1, β(n,1)= | 
 | , β(n,2)= | 
 | 
Beta(x,y) is defined for x and y positive reals 
(to ensure the convergence of the integral) and by
prolongation for x and y if they are not negative integers.
Input :
Output :
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Input :
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