\( \triangle A B C \) में, \( a=9, b=8 \) तथा \( c=4 \), तो \( 3 \cos B-6 \cos C \) का मान है- (...

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\( \triangle A B C \) में, \( a=9, b=8 \) तथा \( c=4 \), तो \( 3 \cos B-6 \cos C \) का मान है-
(A) 4
(B) \( -4 \)
(C) 3
(D) \( -3 \).
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