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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §5.3 Summation versus Integration, #36 · Calculus · Integrals

If … rectangles with base … touch the graph of … at…

If $1/Δ x$ rectangles with base $Δ x$ touch the graph of $v (x)$ at the left end of each interval (thus at $x = 0, Δ x, 2Δ x, \dots$ ) express the total area in sigma notation.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §5.3 Summation versus Integration, #36

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