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This program calculates a Riemann Sum for a function
with two independent variables, taking the form Z = F(x,y); that is
to say, it calculates the sum  ,
approximating the integral  . It is noteworthy
in that it allows the use of expressions in the limits of the inner integral, allowing integration
of non-rectangular regions; however, it is necessary to specify the order of integration.
Values for each rectangular subdivision are calculated at the center of
the subdivision.
Note: This program uses the
calculator's 'Y0', 'Y9', and 'Y8' graphing functions
in it's calculations, and will overwrite any equations
previously stored there.
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