1.1.6

 


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Go To Problems & Solutions

1. An Example

 

Example 1.1

 

 

Note

 

 

We can  use a calculator to find out what this limit might be, as done in Fig. 1.1 as follows.

 

Fig. 1.1

 

 

The limit appears to be 0.5. Now let's find it formally.

 

Solution

 

                               

EOS

 

Indeed the limit is 0.5. Note that in the solution we treat the given expression as a fraction with denominator 1 and
rationalize the numerator by multiplying both the numerator and the denominator by the conjugate of the numerator.

 


Consider the following three trivial limits:


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Problems & Solutions


1.  Evaluate:

 

   


    if it exists.


Solution



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2.  Evaluate:

 

   


     if it exists.

Solution

Note: See problem & solution 1 for more detail of the calculation.



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3.  Find:

   


Solution



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4.  Evaluate:

 

  

 

    if it exists.

 

Solution

 

 

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5.  Find:

 

   

 

     if it exists.

 

Solution

 


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