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misal sisi segitiga itu a,b, dan c
a= 5, b = 6 dan c = √21
sudut terkecil didpan sisi terpendek = c
cos C= (a² +b² - c²) / (2 a b )
cos C = 40/60 = 2/3
sin C = √(1 - cos² C) = √( 1 -4/9) =√5/√9 = 1/3 √5