24 Numerics library [numerics]

24.9 Mathematical functions for floating-point types [c.math]

double       beta(double x, double y);
float        betaf(float x, float y);
long double  betal(long double x, long double y);

Effects: These functions compute the beta function of their respective arguments x and y.

Returns:

$B(x,y)=Γ(x)Γ(y)Γ(x+y) , for x>0,\,{} y>0,$

where x is x and y is y.