a.
Graph the arctangent function and its polynomial approximation by using graphing utility.
a.

Answer to Problem 14PS
Explanation of Solution
Given information:
Using calculus, it can be shown that the arctangent function can be approximated by the polynomial
Where
Use a graphing utility to graph the arctangent function and its polynomial approximation in the same viewing window. How do the graphs compare?
Calculation:
Here, we will consider the approximation of the arctangent function:
Now, we will use graphing utility to compare the arctangent function and its approximation as stated above.
We will press
Now, we will use
Hence, from above we can see that the approximation and the actual function of arctangent follow the same trend but the values are differing by minute values.
b.
Find the changes in the accuracy when an additional term is added.
b.

Answer to Problem 14PS
Explanation of Solution
Given information:
Using calculus, it can be shown that the arctangent function can be approximated by the polynomial
Where
Study the pattern in the polynomial approximation of the arctangent function and predict the next term. Then repeat part
Calculation:
Here, we will consider the following the approximation:
Now, there is a common trend following in the above series that alternatively there is one positive and one negative and the powers are increasing by the factor of
Now, we will use graphing utility to compare the arctangent function and its approximation stated above.
Now, we will press
Now, we will press
Hence, we can see that the above graph is more accurate than the one drawn in part
Chapter 4 Solutions
EBK PRECALCULUS W/LIMITS
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