Question: 4. Let a > 0 be a (fixed) real number. (a) Using lower and upper Riemann sums for x'dx, prove that for any integer n

4. Let a > 0 be a (fixed) real number. (a) Using lower and upper Riemann sums for x'dx, prove that for any integer n 2 1, we have 10 + 20 + ... + ( n - 1 ) as x da

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