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= -cos α
cos 150° = cos (180 - 30)
= -cos 30°
= min stngh akar 3
kuadran 3 = cos (180+α)
= -cos α
cos 210° = cos (180+30)
= -cos 30°
= min stngh akar 3
kalau di kuadran 1&4, cos hasilnya plus