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IBeta Built-in function
  The incomplete beta function.
IBeta[x,p,q] = Integral{0,x, Gamma[p+q]/Gamma[p]Gamma[q] t^(p-1) (1-t)^(q-1)};
Syntax  IBeta(x,p,q)
Notes Works on numbers only. 'p' and 'q' must be non-negative and x should be in [0,1]
Examples
 Last modified: 6/6/2001

 
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