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A note on approximating ex

By S. Lubkin

Communications of the ACM, Vol. 3 No. 12, Pages 649-652

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In reference to the discussion about evaluation ex on page 500 of the September Communications of the ACM, may I point out that there is no need to use Mr. Berin's lengthy expressions to obtain relation (9). If we use the simple formula (5) for x/2 and divide by the same formula for - x/2, we get (9) immediately.

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