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b) 1/2 - V3 + V2
2 a) cos 60 = cos 2(30)
= 2 cos^2(30) - 1
( terbukti)
b) 1-cos 60 = tan 30 - sin 60 ( menurut saya ini soal salah)
1 - 1/2 = 1/3 V3 - 1/2 V3
1/2 = -1/6 V3
tu ruas kiri tidak sama dg ruas kanan