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tan(330)
tan(360-30).....[ IV cuadrante negativo]
-tan(30) = -√3/3
2)
sec(135)
sec(90 + 45)......[ II cuadrante negativo]
Sec cambia a su co-razón (Csc)
-Csc(45) = -1/sen(45) = -√2
3)
sen(2580) = sen(360×7 + 60)
sen(60) = √3/2
Los dos últimos se resuelve parecido a la 3)