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Evaluates the PDF of the Beta distribution.

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The density of the Beta distribution is defined by

$P(x) = \frac{(1-x)^{\beta-1} x^{\alpha-1}}{B(\alpha, \beta)}$

$P(x) = \frac{\Gamma(\alpha + \beta)}{\Gamma(\alpha) \Gamma(\beta)} (1-x)^{\beta-1} x^{\alpha-1}$

$\graph x=0:1, a=1:3:3, b=1:3:3$

x	the value at which to evaluate the function, must be in range 0..1
a	the 1st number of degrees of freedom, must be strictly positive
b	the 2nd number of degrees of freedom, must be strictly positive

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