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The limit of the function is .
The squeeze theorem :
If when is near to and
then .
Use the squeeze theorem:
Find the function lesser than and a function greater than , such that and are approaches to .
The range of cosine function is .
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Multiply throughout the equation.
By the squeeze theorem , and .
, then .
.
Graph :
Graph the functions on the same plane.
(1) Draw the coordinate plane.
(2) Graph the function .
(3) Graph the function .
(4) Graph the function .
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