Mironenko, L.P.; Vlasenko, A.Yu.
(Искусственный интеллект, 2013)
The purpose of the paper is an alternative way of obtaining of the standard limits in the elementary theory of
limits. The approach uses two double inequalities xe^-x ≤ sin x ≤ xe^x and xe^-x ≤ shx ≤ xe^x and the limit
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