Quadratics Exploration
	Take a few minutes to explore what happens as you change the values of a, b and c.    http://www.mathopenref.com/quadraticexplorer.html

	Demo - Frequency
	Scroll down to the bottom of this page for a demonstration of frequency.    http://zonalandeducation.com/mstm/physics/waves/partsOfAWave/waveParts.htm

	Demo - Graphing the Sin, Cos & Tan
	Click on third red button, "Applet: The graphs of sin, cos and tan" to see how the graphs of the trigonometric functions come directly from the unit circle.   http://www.univie.ac.at/future.media/moe/galerie/fun2/fun2.html#sincostan