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Csc(270°) = 1/[sen(270)] = 1/-1 = -1
Cos(180°) = -1
Tan(180°) = 0
2sen(90°) - 3Csc(270°) - 5Cos(180°) + 2Tan(180°)
= 2(1) - 3(-1) - 5(-1) + 2(0)
= 2 + 3 + 5 = 10
Rta: 10