Testing post

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\[ \bigcap \sum \rightarrow \leftarrow \]
% Example 1
\ldots when Einstein introduced his formula
\begin{equation}
\quicklatex{ size=35}
\textbf
e = m \cdot c^2 \; ,
\end{equation}
which is at the same time the most widely known
and the least well understood physical formula.

\[ \quicklatex{color=”#00ff00″ size=35} \frac{d}{dx} \cos \]
\textup
\[ \frac{d}{dx} \cos \]

\frac{d}{dx} \cos

f_k = f(x_k),\: x_k = x^*+kh,\: k=-\frac{N-1}{2},\dots,\frac{N-1}{2}

\[ \left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right) \]

Hello Lucy,

I will answer that for you. First you will need to expand the expressions so you get;
\[ y = 12 + 4x \]
Move 12 to the left hand side to get;
\[ y – 12 = 4x \]
The divide both sides by 4 to get;
\[ \frac{y – 12}{4} = x \]
It does not matter if x comes first because it is the same;
\[ x \frac{y – 12}{4} \]

\[ \color{Blue} x \href{why-equal.html}{=} {\color[Blue] y^2 + 1 1, 2, 4, 8, 16, …} \]

$$ \color{#dd7a05}{y^2 + 1 1, 2, 4, 8, 16, …} $$