\( \triangle A B C \) में, \( a=3, b=4, c=2 \), तो \( \cos \frac{A}{2} \) का मान है-
(A) \( \fra...
\( \triangle A B C \) में, \( a=3, b=4, c=2 \), तो \( \cos \frac{A}{2} \) का मान है-
(A) \( \frac{3 \sqrt{6}}{8} \)
(B) \( \frac{\sqrt{10}}{8} \)
(C) \( \frac{2 \sqrt{6}}{9} \)
(D) \( \frac{\sqrt{10}}{9} \).
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