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Berapa nilai cos sudut B

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Berapa nilai cos sudut B, diketahui segitiga ABC panjang AC 12 cm, AB 18 cm, sudut C 60°...

PEMBAHASAN

18/sin 60° = 12/sin x

18/12 = ½√3 / sin x

3/2 = ½√3 / sin x

3 sin x = √3

sin x = √3/3

cos x = √6/3

cos x = ⅓ √6

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