BETA function
Description
BETA(a,b) returns the Beta function of a and b.
The BETA function is defined by:
$$ \mathrm{Beta}(a,b) = \int_0^1t^{a-1}(1-t)^{b-1}\,\mathrm{d}t $$
$$ \mathrm{Beta}(a,b) = \int_0^1t^{a-1}(1-t)^{b-1}\,\mathrm{d}t $$ Both arguments a and b must be higher than 0.
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