>

  <div class="dfn" label="Derivatives and Partial Derivatives">
            <div class="marginpar">
          The textbook only talks about partial derivatives<span class="larsonfive"> (see Larson 13.3)</span>. We
          emphasize the total derivative because it is more
          powerful, simpler, and helps us understand the concepts
          much better.
        </div>
      Let $f$ be a function.

    <ul>
      <li>The partial derivative of $f$ with respect to $x$ is the
      normal first-semest