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Explain how apply squeeze principle to evaluate the limit cos^2 2x/(3-2x)? x->oo
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Remember that the values of cosine functions are larger than -1 and smaller than 1, therefore the square of the values of cosine function are larger than zero and smaller than 1.
`0 =lt cos^2 (2x) =lt 1`
Because `x-gt+oo =gt 3-2x lt 0`
Divide the inequality by the negative amount 3-2x and reverse the direction of the inequality.
`0/(3-2x) gt= (cos^2 (2x))/(3-2x)gt= 1/(3-2x)`
Evaluate the limits:
`lim_(x->oo)` `0/(3-2x)` `gt=` `lim_(x-gtoo) ``(cos^2 (2x))/(3-2x)` `gt=` `lim_(x-gtoo)``1/(3-2x)`
`0 gt= lim_(x-gtoo) (cos^2 (2x))/(3-2x) gt= 0`
Use the squeeze limit and conclude that `lim_(x-gtoo)` `(cos^2 (2x))/(3-2x) = 0`
Posted by sciencesolve on December 2, 2011 at 1:24 AM (Answer #1)
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