Determinare l'equazione di una funzione trigonometrica

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2v6/ Traduzione in Italiano del video Determining the equation of a trigonometric function http://www.youtube.com/watch?feature=player_embedded&v=yvW5l9W1hgE http://www.khanacademy.org/video/determining-the-equation-of-a-trigonometric-function?playlist=Trigonometry Help us caption & translate this video! http://amara.org/v/B2v6/