This website is intended to help students better understand using Sum and Difference, Double Angle, and Half Angle Formulas to solve Trigonometric Identities.
Citations and Links
http://www.algebralab.org/lessons/lesson.aspx?file=Trigonometry_TrigSumDifference.xmlhttp://mathworld.wolfram.com/Double-AngleFormulas.htmlWeisstein, Eric W. "Double-Angle Formulas." From MathWorld--A Wolfram Web Resource."Sum and Difference Formulas." AlgebraLAB: Making Math and Science Connections. Web. 29 Mar. 2011.