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a = √(b² + c² - 2 b c cosФ)
Si se identifica con la propuesta:
2 cosФ = 2/3; cosФ = 1/3
De modo que Ф = 1,23 rad
tg(1,23 rad) = 2,828 = 2 √2; opción d)
Saludos Herminio