Introduction

Let $x(t)$ be a periodic signal with a time period T and fundamental frequency $w_0=\frac{2\pi}{T}$.Then,

(1)
\begin{align} x(t)=\sum_{k=-\infty}^{\infty}X[k]e^{jkw_0t} \end{align}

There are two methods to analyze the above equation. They are:

1. Direct Method
2. Method of Inspection
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