t circle centered at the origin. A parametrization of this circle is
                    $z(t) = \cos t + i \sin t,$ or
                    $z(t) = e^{it},$ $0 \leq t \leq 2\pi.$
                </p>

                <div class="ggbElement" id="ggb-element-02"></div>
                <p style="text-align: center;margin-top: -10px;"><em>Press</em> <code>Start</code> <em>to animate.</em></p>


            </div>

            <hr>

            <div id="section2">

                <h2>Contours</h2>

            