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2 sinx cosx = 1/2 akar 3
sinx cos x = 1/4 akar 3
Coba 30
sin 30 cos 30 = setengah * setengah akar 3 (Ya)
sin 60 cos 60 = setengah akar 3 * setengah (Ya)
sin 210 cos 210 = Ya
Jadi x = {30, 60, 210 }