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Find the formula for the Riemann sum obtained by dividing the interval `[3,5]` into `n` equal subintervals and using the right endpoint for each `c_k`. Then take the limit of these sums as `n to oo` to calculate the area under the curve `f(x)=4 x` over `[3,5]`.

The area under the curve over `[3,5]` is square units.



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