Evaluate the following integrals as a limit of sums:

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We know,
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where,
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Let,
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Here, f(x) = x
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Now, By putting x = a in f(x) we get,
f(a) = a
Similarly, f(a + h) = a + h
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In this series, a is getting added n times
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Now take h common in remaining series
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Put,
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Since,
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