Today we will solve a power series equation 1+x/2!+x^2/4!+...=0 in two ways!
We will be using the power series for cos(x) and also cosh(x).
Power series of cos(x), https://youtu.be/zgwUMJOXwDM
ln(negative): https://youtu.be/IX_23EWpF5U
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