In: Math
What is the Maclaurin series for the function f(x)=arcsinx. Find the radius of convergence of the series.
Solution:
Given,
Taking the first derivative:
Along with higher derivatives. But this method quickly gets cumbersome, and in fact there is a much faster way of generating the series we need, by using the result [A] whose Maclaurin series we can actually generate very quickly using the the binomial series:
As follows:
Then, we can integrate term by term, to gain the power series for arcsin(x):
It can also be write as
Applying ratio test:
Therefore Radius of convergence
Convergence interval is,