# Write a power series for the function centered at c

Example 4 Find a power series representation for the following function and determine its interval of convergence. The natural question of why we might want to do this will be answered in a couple of sections once we actually learn how to do this. So, hopefully we now have an idea on how to find the power series representation for some functions.

With infinite sums there are some subtleties involved that we need to be careful with but are somewhat beyond the scope of this course.

With this section we will start talking about how to represent functions with power series. Example 3 Find a power series representation for the following function and determine its interval of convergence. The difference is the numerator and at first glance that looks to be an important difference.

Power Series and Functions We opened the last section by saying that we were going to start thinking about applications of series and then promptly spent the section talking about convergence again. This idea of convergence is important here.

Due to the nature of the mathematics on this site it is best views in landscape mode. This is an important idea to remember as it can often greatly simplify our work. Example 1 Find a power series representation for the following function and determine its interval of convergence.

This is actually easier than it might look.

We can now find formulas for higher order derivatives as well now. We now need to look at some further manipulation of power series that we will need to do on occasion. In this way we will hopefully become familiar with some of the kinds of manipulations that we will sometimes need to do when working with power series.

We need to discuss differentiation and integration of power series. Example 5 Find a power series representation for the following function and determine its interval of convergence. More often than not the new interval of convergence will be different from the original interval of convergence.

All we need to do now is a little simplification. Example 2 Find a power series representation for the following function and determine its interval of convergence.

If your device is not in landscape mode many of the equations will run off the side of your device should be able to scroll to see them and some of the menu items will be cut off due to the narrow screen width.The symbol ^ denotes the power function Pow(x, n) implemented in the 1st function, which uses simple iteration.

(3) Exp(x): This function, again, uses the Taylor Series iteration. The series used in iteration is Σ (from int i = 0 to n) {x^i / i!}. the power series of a known function.

More precisely, if f0 (x) = g(x), and if we have a series representation for f and need one for g, we simply di⁄erentiate the series representation of f.

The theorem above tells us that the radius of convergence will be the same. However, we will have to check the endpoints. In this section we discuss how the formula for a convergent Geometric Series can be used to represent some functions as power series.

To use the Geometric Series formula, the function must be able to be put into a specific form, which is often impossible. However, use of this formula does quickly illustrate how functions can be represented as a power.

Find a power series for the function, centered at c, and determine the interval of convergence. centered at c, and determine the interval of convergence. 0 votes. Find a power series for the function, centered at c, and determine the interval of convergence. power series representation centered at (a) for the function, determine all.

Find the power series for f(x) = ex centered at x = 0: This is a nice and easy one since all the derivatives of e x are also e x: In general you start by writing the derivatives out at x = c.

centered at x = 4. We rewrite the function as Exercise Find the power series that represents the following functions: ln(1 + x) tanh-1 x-(1 - x)-2 ; Integrating Impossible Functions. We can use power series to integrate functions where there are no standard techniques of integration available.

Write a power series for the function centered at c
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