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=-cos45
=-1/2√2 (kuadran II jadi negatif)
tan210 =
tan(210) = tan(180+30) = tan(2.90+30)
= tan(30) =1/3 √3
cos1230= cos((3x360)+150)
=cos150=-cos(180-30)
=-cos30=-1/2√3 (kuadran II)