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Math Help - limits # 2 ...urgent

  1. #1
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    limits # 2 ...urgent

    find the limits:
    3. F(x)= (e^x+e^-x)/e^x+1
    4. f(x)=2x/x-3 ln x/3 x=3
    5. f(x)=e^[(2-x)/x] x=5 (x goes to 5)

    any help is appreciated. thanx
    Last edited by mr fantastic; October 5th 2009 at 05:48 PM. Reason: Moved from another thread
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  2. #2
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    3. divide top and bottom by e^x and let x go to infinity (if thats the limit being asked) bearing in mind e^{-x}=\frac{1}{e^x}=0 in the limit x goes to infinity

    5. just plug x=5 into the equation
    Last edited by mr fantastic; October 5th 2009 at 05:49 PM.
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  3. #3
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    What you have written for 3 makes no sense. In order to talk about a "limit" you must have a limit as x goes to some valule. Krahl assumed you were talking about the limit as x goes to infinity. Is that correct?

    For both 4 and 5, just plug the number into the formula.
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