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Find the limit
Only the identity 
and elementary manipulations are allowed. Advanced techniques based on derivatives are not permitted.
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↑ jarrro:
Correct solution. I used a similar idea:
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↑ Marian:function is even, negative, bounded and continous on
. Moreover it is on
dereasing and on
is increasing.
but I cannot prove this without differential calculus
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↑ Marian:
The existence of the limit was assumed implicitly. Although I agree that your questions are important.
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