Function for geometric shape of a love symbol

						JXG.Options.axis.ticks.insertTicks = false;
JXG.Options.axis.ticks.ticksDistance =  10;
var board = JXG.JSXGraph.initBoard('box1', {
boundingbox: [-3, 3, 3, -3],showcopyright: false,showNavigation: false,axis: true,defaultAxes: {
    y: { ticks: {majorHeight: 5 } },
	x: { ticks: {majorHeight: 5 } },
  }, 
});
var f1 = board.create('functiongraph',[function(x){ return Math.acos(1-Math.abs(x))-Math.PI;}, -10, 10]);
var f2 = board.create('functiongraph',[function(x){ return Math.sqrt(1-(Math.abs(x)-1)*(Math.abs(x)-1));}, -10, 10]);