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Lição 9: Identidades trigonométricas de soma de ângulos

Uso das identidades trigonométricas de soma de ângulos

Calcule cosine, left parenthesis, angle, B, A, C, minus, 60, degrees, right parenthesis.

(Escolha A)
start fraction, 6, divided by, 13, end fraction, minus, start fraction, 5, divided by, 26, end fraction, square root of, 3, end square root
(Escolha B)
start fraction, 5, divided by, 26, end fraction, minus, start fraction, 6, divided by, 13, end fraction, square root of, 3, end square root
(Escolha C)
start fraction, 6, divided by, 13, end fraction, plus, start fraction, 5, divided by, 26, end fraction, square root of, 3, end square root
(Escolha D)
start fraction, 5, divided by, 26, end fraction, plus, start fraction, 6, divided by, 13, end fraction, square root of, 3, end square root

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