This is a video is about using known Maclaurin series forms to make series for other functions. The series act like functions themself. So, that lets us alter the argument with composition. This gets us a new series. Then with the new series we recognize that it is a polynomial. That lets us multiply the series by a single term. What happens when we need to multiply the series by another series? The answer to that question is the 4th example where we find the first 4 terms of the product of two series.
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