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    sunycar's Avatar
    sunycar Posts: 4, Reputation: 1
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    #1

    Mar 10, 2009, 04:50 PM
    sandwich theorem
    find the Lim when X---- -infinity of the following 7X^- cos 4X all divided by X^+15
    ^ this simbols means to the second power
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Mar 10, 2009, 05:48 PM
    Is this what you mean?:



    Please clarify, do you have to use the Squeeze Theorem on this?

    Graph it and see what it looks like. That will help you see the limit.

    This is a tricky one. A calculator may even tell you it's undefined. But...
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    sunycar Posts: 4, Reputation: 1
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    #3

    Mar 11, 2009, 04:04 PM
    Thanks for your replay, yes the sandwich Thm has to be used to solve this problem, the degree of X in the numerator is 2 and the expression in the denominator is X to the second degree pluss 15. The limit is for X at negative infinity.
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    galactus Posts: 2,271, Reputation: 282
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    #4

    Mar 11, 2009, 05:20 PM

    The degree of x in the numerator is 2? Then where did the cos4x come from?
    sunycar's Avatar
    sunycar Posts: 4, Reputation: 1
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    #5

    Mar 12, 2009, 06:00 AM
    the whole expression if a function and the task is to find the limit of tha function.

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