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4.-cos(180+20) + 2.cos(180-20) + k.cos20 = 0 (perhatikan kuadrannya)
4.-cos20 + 2.-cos20 + k.cos20 = 0
misalkan cos20 = a
-4a + (-2a) + k.a = 0
-6a + k.a =0
k.a = 6.a
k = 6