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This program calculates a Riemann sum for a function
having three independent variables, taking the form R=F(x,y,z); that
is, it calculates the sum  ,
approximating the integral  . As with
the 2D Riemann program, this allows the use of expressions in the
inner two integrals, allowing integration of non-rectangular
volumes; it is necessary, however, to specify the order of
integration. Values for each sub-region are calculated at the center
of the sub-region.
Note: This program uses the
calculator's 'Y0', 'Y9', 'Y8', 'Y7' and 'Y6' graphing functions
in it's calculations, and will overwrite any equations previously
stored there.
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