Solving a "power series" equation!

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),    • Power series of sin(x) and cos(x) at 0   ln(negative):    • ln(-2), yes possible, but NOT real!   ---------------------------------------- 💪 Support this channel and get my math notes by becoming a patron:   / blackpenredpen   🛍 Shop my math t-shirt & hoodies: https://amzn.to/3qBeuw6 ---------------------------------------- #blackpenredpen #math #calculus #mathtutorial