pplet with $0 \leq t\leq 1.$
                </p>

                <div class="ggbElement" id="ggb-element-01"></div>
                <p style="text-align: center;margin-top: -10px;">
                    <em>Press</em> <code>Start</code> <em>to animate. You can move the points to change the
                        curve.</em>
                </p>

                <p>
                    For example, the parametric equations $x = \cos t,$ $y = \sin t,$ $0 \leq t \leq 2\pi,$
                    describe a uni