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To represent mathematical expressions, functions, or key formulas cleanly in HTML, standard semantic elements like <code>, <var>, and <sup> or <sub> are used.
Below are 8 key structural examples written in clean, strict HTML:
<!-- 1. Linear Function -->
<p>
<code><var>f</var>(<var>x</var>) = <var>m</var><var>x</var> + <var>b</var></code>
</p>
<!-- 2. Quadratic Equation (Standard Form) -->
<p>
<code><var>a</var><var>x</var><sup>2</sup> + <var>b</var><var>x</var> + <var>c</var> = 0</code>
</p>
<!-- 3. Pythagorean Theorem -->
<p>
<code><var>a</var><sup>2</sup> + <var>b</var><sup>2</sup> = <var>c</var><sup>2</sup></code>
</p>
<!-- 4. Area of a Circle -->
<p>
<code><var>A</var> = π<var>r</var><sup>2</sup></code>
</p>
<!-- 5. Mass-Energy Equivalence -->
<p>
<code><var>E</var> = <var>m</var><var>c</var><sup>2</sup></code>
</p>
<!-- 6. Logarithmic Identity -->
<p>
<code>log<sub><var>b</var></sub>(<var>x</var>) = <var>y</var></code>
</p>
<!-- 7. Newton's Second Law -->
<p>
<code><var>F</var> = <var>m</var><var>a</var></code>
</p>
<!-- 8. Definition of Slope -->
<p>
<code><var>m</var> = (Δ<var>y</var>) / (Δ<var>x</var>)</code>
</p>
