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# scipy.special.betainc

`scipy.special.``betainc`(x1, x2, x3[, out])
  y=betainc(a,b,x) returns the incomplete beta integral of the arguments, evaluated from zero to x: gamma(a+b) / (gamma(a)*gamma(b)) * integral(t**(a-1) (1-t)**(b-1), t=0..x).

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