Hello. I have the following problem:

Let

Determine the Taylor Polynomial at x = 0

I have : which should be correct

Now i have to show that the approx. Error in the Intervall [-0.1;0.1] is smaller than How do i do that ? I have a formula for Langrage´s Rest but not sure how to apply it here

Edit: I should mention that we have to evaluate the polynomial to the 3rd term