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catherinesquitieri
26.07.2019 •
Mathematics
Use the power series for 1 1−x to find a power series representation of f(x) = ln(1−x). what is the radius of convergence? (note: you don’t need to use the ratio test here because we know the radius of convergence of the series p∞ n=0 x n .) (b) use part (a) to find a power series for f(x) = x ln(1 − x). (c) by putting x = 1 2 in your result from part (a), express ln 2 as the sum of an infinite series
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Ответ:
The power series of f(x) = ln(1 - x) is
, the power series of xln(1 - x) is
and the value of ln(2) is
.
Given :
f(x) = ln (1−x)
a) The integration of 1/(1 - x) is given by:
When |x| >1 :
Now, integrate on both sides in the above equation.
Now, at (x = 0) the above expression becomes:
By simplifying the above expression in order to get the value of C.
C = 0
Now, substitute the value of C in expression (1).
Now, by shifting the index the above expression becomes:
b) Now, multiply by 'x' in the above expression in order to get the power series of (x ln(1 - x)).
c) Now, substitute the value x = 1/2 in the expression (1).
For more information, refer to the link given below:
link
Ответ:
a. Recall that
For
, we have
By integrating both sides, we get
If
, then
so that
We can shift the index to simplify the sum slightly.
b. The power series for
can be obtained simply by multiplying both sides of the series above by
.
c. We have
Ответ:
b
Step-by-step explanation: