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cos∅ = -2/3, 90°< ∅<180° -> Kuadran II

Cos ∅= samping/miring = - 2 /3

Samping = 2
miring = 3
depan = √3² - 2² = √9 - 4 = √5

Tan∅= √5 / 3 = 1/3√5

Karena letaknya ada di kuadran II berarti Tan∅ = -1/3√5 (B)