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sisi depan segitiga = 8, sisi samping = 15
Jawaban = cari sisi miring segitiga
akar 8 kuadrat+15 kuadrat= akar 64+225= akar 289=17
Cos a = samping/miring = 15/17
tapi karena kuadrat 2 maka cos a bernilai min = -15/17