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AB=6, AC=10, sudut A=60
BC=?
Anggaplah BC=di bagian bawah
pake persamaan cosinus.
berarti = {36+100}-2.6.10COS60
BC = 136-12.10.
BC = 136 - 12.5
BC = 136 - 60
BC = 76
karena BC = , maka BC = atau bisa diperkecil