hows this work?

$$<br /> let x = 1; <br /> let y = 0; <br /> for (let i = 0; i&lt;1000000; i++) { <br /> let prevX = x; <br /> x = x*Math.cos(.01) + y*Math.sin(.01); <br /> y = y*Math.cos(.01) - prevX*Math.sin(.01);<br /> //x and y are coordinates moving around a circle<br />$$