LaTeX: Formula equal sign alignment

$\text{LATEX}$ formula equal sign alignment

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1. Formula equal sign alignment

Use the following format in the formula:

\begin{aligned}
* &= * \\
* &= * \\
* &= *
\end{aligned}

When using it, just replace the "*" with the content you need.
Supplement: Need to be used in formula environment.

E.g:

\begin{aligned}
A &= B + C \\
&= C + D + C \\
&= 2C + D
\end{aligned}

The effect is as follows:
$$\begin{array}{rl}A& =B+C\\ & =C+D+C\\ & =2c+D\end{array}$$

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