Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsCosine and Sine of the Sum of Two Angleshttp://demonstrations.wolfram.com/CosineAndSineOfTheSumOfTwoAngles/]]>http://demonstrations.wolfram.com/CosineAndSineOfTheSumOfTwoAngles/Clock Hand Tipshttp://demonstrations.wolfram.com/ClockHandTips/]]>http://demonstrations.wolfram.com/ClockHandTips/Proof of the Difference Formula for Sine and of the Addition Formula for Cosinehttp://demonstrations.wolfram.com/ProofOfTheDifferenceFormulaForSineAndOfTheAdditionFormulaFor/]]>http://demonstrations.wolfram.com/ProofOfTheDifferenceFormulaForSineAndOfTheAdditionFormulaFor/Dissection Proof of the Addition Formula for Sineshttp://demonstrations.wolfram.com/DissectionProofOfTheAdditionFormulaForSines/]]>http://demonstrations.wolfram.com/DissectionProofOfTheAdditionFormulaForSines/Difference Formula for Cosinehttp://demonstrations.wolfram.com/DifferenceFormulaForCosine/]]>http://demonstrations.wolfram.com/DifferenceFormulaForCosine/A Sine/Cosine Identityhttp://demonstrations.wolfram.com/ASineCosineIdentity/]]>http://demonstrations.wolfram.com/ASineCosineIdentity/Addition Formula for Sinehttp://demonstrations.wolfram.com/AdditionFormulaForSine/]]>http://demonstrations.wolfram.com/AdditionFormulaForSine/A Proof of the Difference Identity for Cosinehttp://demonstrations.wolfram.com/AProofOfTheDifferenceIdentityForCosine/]]>http://demonstrations.wolfram.com/AProofOfTheDifferenceIdentityForCosine/Beats Workinghttp://demonstrations.wolfram.com/BeatsWorking/]]>http://demonstrations.wolfram.com/BeatsWorking/