2.- Sabiendo que los vectores: r_1 y r_2, son vectores unitarios contenidos en el plano xy de forman ángulos: alfa y beta con el semieje x positivo. Con i, =cosal + senaj Ycos Bi-sen Bj. mediante la aplicación del producto punto entre los vectores muestra que : cos(a+8)= cos a cos B-sen a sen ß.

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