Does anybody know what algorithm the TI-84 calculators use to find integrals?

The [Math] > 9:fnInt( function, as well as the [2nd][Trace](Calc) 7:∫f(x)dx function, uses the Gauss-Kronrod quadrature method to approximate definite integrals. You can read more about this method at a href="http://mathworld.wolfram.com/Gauss-KronrodQuadrature.html" rel="nofollow"http://mathworld.wolfram.com/Gauss-Kronr…/a and a href="http://en.wikipedia.org/wiki/Gauss%E2%80%93Kronrod_quadrature_formula" rel="nofollow"http://en.wikipedia.org/wiki/Gauss%E2%80…/a