Ripasso/Divertimento con le Identita' Trigonometriche

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2vD/ Esercizi: http://www.khanacademy.org/exercise/trig_identities_1 Traduzione in Italiano del video Trigonometry Identity Review/Fun http://www.youtube.com/watch?v=a70-dYvDJZY&feature=player_embedded http://www.khanacademy.org/video/trigonometry-identity-review-fun?topic=trigonometry Help us caption & translate this video! http://amara.org/v/B2vD/