Oscillation

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\documentclass[border=3pt]{standalone}
%Drawing
\usepackage{tikz}
%Notation
\usepackage{physics}
\usepackage{bm}
%Tikz Library
\usetikzlibrary{calc, patterns}
%Newcommand
%%Midline Label
\newcommand{\midlinelabel}[3]{
   \node[shift={(3.5,0)}] (midlabel) at ($ (#1)!.5!(#2) $) {#3};
   \draw[latex-,thick] ($(#1)+(3.5,0)$) --  (midlabel);
   \draw[-latex,thick] (midlabel) -- ($(#2)+(3.5,0)$);
}
\begin{document}
    
    \begin{tikzpicture}
%       %Grid
%       \draw[thin, dotted] (0,0) grid (8,8);
%       \foreach \i in {1,...,8}
%       {
%           \node at (\i,-2ex) {\i};    
%       }
%       \foreach \i in {1,...,8}
%       {
%           \node at (-2ex,\i) {\i};    
%       }
%       \node at (-2ex,-2ex) {0};
        
        %Coordinate
        \coordinate (A) at (0,8);
        \coordinate (A') at ($(A)+(0.5,0)$);
 
 
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