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Prove by direct method that for any real numbers $x, y$ if $x=$ $y$, then $x^2=y^2$
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Verified Answer
If $x=y$ then
$$
\begin{aligned}
&\Rightarrow \quad x_1 x=x \cdot y \\
&\Rightarrow \quad x^2=y^2
\end{aligned}
$$
$$
\begin{aligned}
&\Rightarrow \quad x_1 x=x \cdot y \\
&\Rightarrow \quad x^2=y^2
\end{aligned}
$$
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