 - 1) - 4
x*x*x - sqrt(2.)*x
-exp(-x - 1) + 4
</textarea>
	<br>
	<p id="error" class="comment"></p>
	</div>
	<div style="text-align: center; margin-bottom: 12pt;">
	<canvas id="canvas" width=640 height=640></canvas>
	</div>
	<div style="text-align: center; margin-bottom: 12pt;">
	<i>x</i>: <input type="text" id="center_x" value="0" onInput="draw_canvas()"/> &nbsp;&nbsp;&nbsp;&nbsp;
	<i>y</i>: <input type="text" id="center_y" value="0" onInput="draw_canvas()"/> &nbsp;&nbsp;&nbsp;&nbsp;
	<nobr>multiplier:
		<