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int{ int{ f(x(t1),y(t2)) dt1 dt2 } } limit over t1 {0 : pa} and over t2 {o:pb}.

Now i have a data set for x for equal spaced t1 values varing from 0 to pa .

and for y for equal spaced t2 values varing from 0 to pb.

I will be very happy if anyone could help me ?