JSXGraph
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Versiera di Agnesi
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<iframe 
    src="http://jsxgraph.uni-bayreuth.de/share/iframe/versiera-di-agnesi" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Versiera di Agnesi" 
    allowfullscreen
></iframe>
This code has to 
<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 12 / 10; width: 100%;" data-ar="12 / 10"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution 4.0 International License.
    https://creativecommons.org/licenses/by/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    const board = JXG.JSXGraph.initBoard(BOARDID, {
        boundingbox: [-5, 5, 7, -5],
        axis: true
    });
    
    var a = board.create('slider', [[1,4], [4,4], [-5, 1, 5]], {name: 'a'});
    
    var c = board.create('curve', [
        (t) => a.Value() * t,
        (t) => a.Value() / (t * t + 1)
    ], {strokeWidth: 3});
    
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution 4.0 International License.
https://creativecommons.org/licenses/by/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

const board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-5, 5, 7, -5],
    axis: true
});

var a = board.create('slider', [[1,4], [4,4], [-5, 1, 5]], {name: 'a'});

var c = board.create('curve', [
    (t) => a.Value() * t,
    (t) => a.Value() / (t * t + 1)
], {strokeWidth: 3});

<jsxgraph width="100%" aspect-ratio="12 / 10" title="Versiera di Agnesi" description="This construction was copied from JSXGraph examples database: BTW HERE SHOULD BE A GENERATED LINKuseGlobalJS="false">
   /*
   This example is licensed under a 
   Creative Commons Attribution 4.0 International License.
   https://creativecommons.org/licenses/by/4.0/
   
   Please note you have to mention 
   The Center of Mobile Learning with Digital Technology
   in the credits.
   */
   
   const board = JXG.JSXGraph.initBoard(BOARDID, {
       boundingbox: [-5, 5, 7, -5],
       axis: true
   });
   
   var a = board.create('slider', [[1,4], [4,4], [-5, 1, 5]], {name: 'a'});
   
   var c = board.create('curve', [
       (t) => a.Value() * t,
       (t) => a.Value() / (t * t + 1)
   ], {strokeWidth: 3});
   
</jsxgraph>

Versiera di Agnesi

Curves
Parameter form: \[ \begin{aligned} x(t) &= a t, \\ y(t) &= {a\over t^2 + 1} \\ \end{aligned} \]
Web references 
// Define the id of your board in BOARDID

const board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-5, 5, 7, -5],
    axis: true
});

var a = board.create('slider', [[1,4], [4,4], [-5, 1, 5]], {name: 'a'});

var c = board.create('curve', [
    (t) => a.Value() * t,
    (t) => a.Value() / (t * t + 1)
], {strokeWidth: 3});

license

This example is licensed under a Creative Commons Attribution 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.