00:01
In this question, given the function f of x, we are asked to find the power series representation for this function around zero.
00:09
First of all, notice that this function f of x is a derivative of the following function g of x, which is equal to minus 1 over 3 plus x.
00:25
Indeed, if we differentiate g of x, we are going to get minus negative 1 over 3 plus x.
00:35
3 plus x squared.
00:38
Now negative ones cancel and we are going to get 1 over 3 plus x squared.
00:45
Now let's find the power series representation for the function g of x.
00:52
First of all, we will have to rewrite g of x a little bit.
00:56
Let's factor out 3 from the denominator.
00:59
We are going to get minus 1 3 times 1 over 1 plus x over 3.
01:08
Now we can rewrite this as minus 1 3rd times 1 over 1 minus minus x over 3...