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## Homework Statement

This topic is under linear system differential equation.Solve the system by using exponential method. Just want to ask the expansion of exponential function

## Homework Equations

e^x=1+x+(x^2)/2!+(x^3)/3!+........

## The Attempt at a Solution

then how about the e^(-x)=?

Besides what is the function of sin x and cos x in continued function (such in e^x)?

Thanks!