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= 2 Sin 1/2(2phi/3) cos 1/2(4phi/3)
= 2 Sin 1/2(120) cos 1/2(240)
= 2 Sin (60) cos (120 )
= 2(1/2 dari akar 3) di kali (-1/2)
untuk 1/2 dari akar tiga-Nya.. tolong di cari sendiri yah :)