In a triangle ABC, sin A: sin B: sin C = 4: 5:6 while cos A...

 

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In a triangle ABC, sin A: sin B: sin C = 4: 5:6 while cos A : cos B: cos C = x: y: 2. The ordered pair (x, y) is [Note : All symbols used have usual meaning in triangle ABC] (A) (5, 4) (B) (9, 6) (C) (10, 5) (D) (12, 9) In a triangle ABC, sin A: sin B: sin C = 4: 5:6 while cos A : cos B: cos C = x: y: 2. The ordered pair (x, y) is [Note : All symbols used have usual meaning in triangle ABC] (A) (5, 4) (B) (9, 6) (C) (10, 5) (D) (12, 9)