Showing the <a href="https://en.wikipedia.org/wiki/cusp_(singularity)" class="extiw" title="w:cusp (singularity)">cusp</a> of the cubic curve (<a href="https://en.wikipedia.org/wiki/semicubical_parabola" class="extiw" title="w:semicubical parabola">semicubical parabola</a>)
<dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle y^{2}=x^{3}\,}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><msup><mi>y</mi><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msup><mo>=</mo><msup><mi>x</mi><mrow class="MJX-TeXAtom-ORD"><mn>3</mn></mrow></msup><mspace width="thinmathspace"></mspace></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle y^{2}=x^{3}\,}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ee4df3b9c8e3312bfcd1a498da3d8dca7143620b" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.671ex; width:8.084ex; height:3.009ex;" alt="y^{2}=x^{3}\,"></span></dd></dl>
The curve is a single <a href="https://en.wikipedia.org/wiki/b%C3%A9zier_curve" class="extiw" title="w:bézier curve">bézier curve</a> with end points (9,27) resp. (9,−27) and control points (−3,−27) resp. (−3,27).
<a href="//commons.wikimedia.org/wiki/User:Georg-Johann" title="User:Georg-Johann">Georg-Johann</a>
<span class="int-own-work" lang="en">Own work</span>